Discovery’s Five Deeps Expedition Breaks Record on Dive to Bottom of Challenger Deep In Mariana Trench

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New York – For the fourth time, the Five Deeps Expedition has successfully dived to the bottom of one of the world’s five oceans. The team completed a mission to reach what is commonly known as the deepest point on planet Earth: Challenger Deep within the Mariana Trench. Victor Vescovo set a new deep-diving record and is the first human to make multiple dives, solo, to its hadal depths in the DSV Limiting Factor (Triton 36000/2 model submersible) the world’s deepest diving, currently operational submarine. The expedition reached a maximum depth of 10,928 meters[1] / 35,853 feet deep, 16 meters/52 feet deeper than any previous manned dive.

The Five Deeps Expedition is being filmed by Atlantic Productions for a five-part Discovery Channel documentary series, DEEP PLANET, that will air in later in 2019.

The last visit to the bottom of Challenger Deep was made in 2012 by filmmaker and explorer James Cameron, who reached a depth of 10,908 meters on a dive in his submersible, the Deepsea Challenger.[2] Prior to Cameron’s dive, the first ever dive at Challenger Deep was made by the Trieste, a US Navy deep submergence bathyscape, in 1960 to 10,912 meters by Lieutenant Don Walsh and Swiss scientist Jacques Piccard.[3] Both the Trieste and Deepsea Challenger only descended to the bottom of Challenger Deep once.

Between April 28 and May 5, 2019, the Limiting Factor completed four dives to the bottom of Challenger Deep and one final dive on May 7, 2019 to the Sirena Deep which is also in the Mariana Trench, approximately 128 miles to the northeast. Two of the dives, including the deepest one made on April 28, were solo dives piloted by Vescovo.


The full diving program during this phase of the overall expedition consisted of:


  1. Dive #1 (April 28, 2019): Solo dive to bottom of the ‘Eastern Pool’ of the Challenger Deep to 10,928 meters (Victor Vescovo, Pilot). The expedition has calculated that this was the deepest dive by any human in history (see the footnote, page 1, for the methodology and rationale used in making this assessment). Four hours (248 minutes) were spent on the bottom exploring the basin, which is now the longest period of time ever spent on the bottom of the ocean by an individual.


  1. Dive #2 (May 1, 2019): A second, solo dive to the bottom of the ‘Eastern Pool’ of the Challenger Deep to 10,927 meters (Victor Vescovo, Pilot). Three hours (217 minutes) were spent on the bottom including extensive exploration of the southern, rocky slope of the Deep.
  2. Dive #3 (May 3, 2019): DNV GL Commercial Certification Dive and Lander Salvage in the ‘Eastern Pool’ of the Challenger Deep (Patrick Lahey, Pilot; Jonathan Struwe, Specialist). This was the deepest marine salvage operation ever attempted and was successful. A Five Deeps Expedition scientific lander was stuck on bottom during the previous dive (#2) and was freed and recovered from 10,927 meters by direct action of the manned submersible. The submarine also passed all of its qualification tests and commercial certification by DNV GL was granted. This makes the Limiting Factor the first full ocean depth-capable submersible to meet commercial safety standards and be granted commercial operating certification. (All previous submersibles achieving this depth historically were considered “experimental.”) Approximately 2.5 hours (163 minutes) were spent on the bottom by the sub and 2.5 days by the lander.
  3. Dive #4 (May 5, 2019): Scientific Dive in the ‘Central Pool’ of the Challenger Deep (Patrick Lahey, Pilot; John Ramsay, Sub Designer). Video surveying and biological samples were collected by the submersible and its landers for scientific analysis. The major focus was to investigate the north and southern edges of the subduction zones in the Challenger Deep. Time on bottom was approximately three hours (184 minutes).
  4. Dive #5 (May 7, 2019): Scientific Dive in the Sirena Deep which is part of the Mariana Trench (Victor Vescovo, Pilot; Dr. Alan Jamieson, Chief Scientist). First manned descent to the bottom of the Sirena Deep, which focused on geological, biological, and video survey and collection in the trench basin. Time on bottom was three hours (176 minutes) and the deepest piece of mantle rock ever recovered from the surface of the western slope of the Mariana Trench was collected.



“It is almost indescribable how excited all of us are about achieving what we just did,” said Vescovo after arriving in Guam after the completion of the dives. “This submarine and its mother ship, along with its extraordinarily talented expedition team, took marine technology to an unprecedented new level by diving – rapidly and repeatedly – into the deepest, harshest area of the ocean. We feel like we have just created, validated, and opened a powerful door to discover and visit any place, any time, in the ocean – which is 90% unexplored.”

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On board the DSSV Pressure Drop for this historic accomplishment was legendary American oceanographer, explorer and marine policy specialist, Dr. Don Walsh (Captain, USN Ret.), who made the first successful decent into the Mariana Trench in 1960. The maximum depth achieved was measured and later corrected to be approximately 10,916 meters.


“Victor Vescovo’s imagination and fierce curiosity; Triton Submarines technical brilliance, and the outstanding performance of the officers and crew of mother ship Pressure Drop all converged to make this expedition a huge success. And I was there to see it,” said Dr. Don Walsh (Captain, USN Ret.). “Nearly six decades ago Jacques Piccard and I were first persons to dive into Challenger Deep, the deepest place in the World Ocean. Then in 2012 James Cameron made a solo dive there. And now in 2019, ‘The Five Deeps Expedition’s submersible Limiting Factor was the third.”


Walsh continued, “This time it was an impressive tour de force as the team repeated the Challenger Deep dive four times in just eight days. This was a demonstration of system reliability and operational efficiency never seen before in exploration of the oceans’ deepest places. I was proud and honored to have been invited to be part of Victor’s team when it made world history at Challenger Deep.”


As with every other previous expedition dive, the team extensively measured and mapped the operating area with a Kongsberg EM124 sonar to pinpoint the desired dive sites. Once on the bottom, Vescovo or the two-person sub team of pilot and specialist usually spent 3-4 hours on the bottom conducting their survey and science missions. On average, it required 3.5 hours for the submersible to reach the bottom of the Challenger Deep and 3.5 hours to ascend. The average total mission duration lasted from 11-12 hours including one hour combined for launch and recovery of the sub from the surface, well under the submersible’s required life support endurance of four days with two persons onboard.


With his dives, Vescovo also became the first person to have summitted Mount Everest and been to the bottom of the ocean, as well as having skied to both the North and South poles. Thus, he is the first to have completed visiting one version of the “Four Corners of the Earth”: Mt. Everest, Challenger Deep, and both geographic poles. In 2011, he completed the Seven Summits – climbing the highest peak on every continent – and has now been to the bottom of four of the world’s oceans.


Other firsts or notable features of this recent phase (April 26 – May 7, 2019) of the Five Deeps Expedition:


  • Deepest dive in history, to 10,928 meters, surpassing the Trieste’s maximum depth of 10,912 meters reached in 1960. (Vescovo)
  • The deepest solo dives (two) in a submersible (Vescovo), to 10,928 and 10,927 meters.
  • The greatest number of solo dives by an individual below 7,000 meters, now at six times (Vescovo).
  • The first individual (Vescovo) to dive the Challenger Deep twice, and both were solo dives. Patrick Lahey of Triton Submarines become the second person to dive the Challenger Deep twice, on two-person missions that followed Vescovo’s solo dives with a maximum depth reached of 10,927 meters. This also made Lahey the second Canadian to reach the bottom, after James Cameron.
  • The first time any submersible has been to the bottom of the Challenger Deep more than once. In this case, four times in eight days by the DSV Limiting Factor.
  • The Limiting Factor executed the deepest marine salvage operation in history by searching for, and locating, one of the expedition’s scientific landers on the bottom of the Challenger Deep and freeing it from deep silt that had trapped it on the bottom. The recovery was made using the submersible’s manipulator arm at 10,927 meters. The lander was stranded on the bottom for 2.5 days.
  • John Ramsay, an Englishman by birth and the submersible’s principal structural designer, became the first British citizen to descend to the bottom of the Challenger Deep. Coincidentally, the Challenger Deep was named after a British ship the HMS Challenger.
  • Jonathan Struwe, a marine engineer and inspector with DNV GL, became the first German citizen to descend to the bottom of the Challenger Deep.
  • The first manned dive into to the Sirena Deep, 128 miles to the northeast of the Challenger Deep, but also in the Mariana Trench, to a maximum depth of 10,714 meters. Vescovo piloted, with Dr. Alan Jamieson, the expedition’s Chief Scientist, acting as scientific mission specialist. Three hours on bottom and the first-ever rocks collected from that deep.
  • Four ocean bottoms, of five, how now been visited by one person (Vescovo) with one more to dive – the Molloy Deep in the Arctic Ocean – which is the shallowest of the five at an estimated 5,669 meters.
  • The scientific team identified at least three new species of marine animal during this dive series, including a type of long-appendaged Amphipod, discovered at the bottom of the Challenger Deep.
  • The first US State flag – of Texas – to be taken to the summit of Mt. Everest and down to the bottom of the ocean. Vescovo’s personal mountaineering ice axe has also made the journey to the highest and lowest points on earth.
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“Our goal was to build a submersible capable of repeated dives to any depth with its pedigree and security assured by third party accreditation,” said Patrick Lahey, President of Triton Submarines. “Our dives in the Mariana Trench demonstrate we achieved our objective. The Triton 36,000/2 (“LF”) represents a quantum leap in the capabilities of a manned submersible and everyone at Triton is immensely proud to have had the privilege and opportunity to create such a remarkable craft, which was only possible by the unwavering support and vision of Victor Vescovo.”


“It has been a monumental week for ocean exploration; we have broken world records and achieved a number of world firsts. Most importantly we have opened the door to the final frontier — the exploration of the hadal zone and the workings of the deepest parts of the world’s oceans,” said expedition leader Rob McCallum.


“This vehicle is effectively a reliable elevator that can transport us to any depth, in any ocean. During this expedition we have traversed over 110 vertical kilometers (68 miles) and proved the capabilities of a vehicle that will be a platform for science, film making and exploration of Earths hidden recesses,” McCallum added.


The next stop on the Five Deeps Expedition is the Horizon Deep within the Tonga Trench in the South Pacific Ocean. Previously measured at 10,882 meters deep, the Tonga Trench is widely known as the second-deepest ocean trench in the world. Due to the small difference in measured depths between the Challenger and Horizon Deeps, Vescovo and team plan to find out, once and for all, if the Tonga Trench is actually only second-deepest in the Pacific or if it actually deeper than the Mariana Trench.


After the Tonga Trench diving program is complete, the Five Deeps Expedition team will stop once more at the Puerto Rico Trench (Atlantic Ocean, 8.376 meters) on its way to the overall expedition’s fifth and final “Deep” dive in late August, the Molloy Deep in the Arctic Ocean. The mission at the Puerto Rico Trench is to perform science dives in a location previously visited by the French submersible Archimède in 1964.


For updates on the expedition, visit and follow along on Facebook, Instagram and Twitter, @FiveDeeps. The website also has a detailed blog of the latest voyage ( and all other information one might need regarding the technology, scientific goals, crew and team bios, expedition overview.




Partnership opportunities
Organizations are welcome to submit interest in supporting the expedition and its scientific missions to


About Caladan Oceanic

Caladan Oceanic is a private company dedicated to the advancement of undersea technology and supporting expeditions to increase the understanding of the oceans. Founder Victor Vescovo has long had a passion for exploration and has summited the highest peak on all seven of the world’s continents including Mt. Everest and skied at least 100 kilometers to both the North and South Poles. He also served for 20 years as an officer in the US Navy Reserve, retiring with the rank of Commander. With the completion of the Five Deeps Expedition, Vescovo could become the first person in history to have been to the top of all the world’s continents, both poles, and the bottom of all its oceans.


About Triton Submarines, LLC

Triton Submarines of Sebastian, Florida, is the most experienced civil submarine producer in the world today – and the only contemporary manufacturer of acrylic and

titanium pressure-hull-equipped personal submarines to deliver multiple classed and certified vessels capable of diving to 36,090 feet (11,000 meters) or more. Triton Submarines’ senior staff have over 350 years of combined experience with more than 80 different submersibles, and their operations team members have together logged over 25,000 dives. Triton clients also enjoy superlative after-sales service and technical support from a company dedicated to their total satisfaction.

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About EYOS Expeditions

EYOS Expeditions has been designing complex and challenging expeditions for private vessels since 2008. Drawing on the decades of experience of the company’s co-founders, the EYOS team has delivered over 1,200 safe and successful expeditions to some of the most remote destinations on Earth. EYOS Expeditions holds several “world firsts” and routinely takes clients to destinations rarely or never before visited. EYOS Expeditions and sister company Expedition Voyage Consultants has worked behind the scenes on many of the industry’s groundbreaking itineraries and has a long history of delivering once-in-a-lifetime experiences for clients while maintaining the highest standards of safety, professionalism and environmental stewardship. EYOS Expeditions is today regarded as the industry leader for planning and operating remote expeditions using submersibles.



About Atlantic Productions

Atlantic embraces several companies including the BAFTA- and Emmy-winning special effects company ZOO VFX and virtual reality company Alchemy. In 25 years, it has built a reputation for world-class storytelling, enhanced by the latest technology. Their diverse output includes 11 projects with David Attenborough including BAFTA award-winning Flying Monsters, Museum Alive (Sky) and The Great Barrier Reef; Inside the Commons (BBC), Time Scanners (NatGeo), Mission Galapagos (BBC), Jerusalem, City of Heaven (Discovery) and the acclaimed theatrical film The Wildest Dream: Conquest of Everest. Recent projects include the critically acclaimed Judi Dench: My Passion for Trees (BBC) and The Coronation (BBC/Smithsonian/ABC), made with the Queen. Atlantic won the first-ever BAFTA award for virtual reality with David Attenborough’s Great Barrier Reef Dive. Discovery Channel have commissioned Atlantic Productions to film a five-part documentary series covering the Five Deeps mission.


About Discovery Channel

Discovery Channel is dedicated to creating the highest quality non-fiction content that informs and entertains its consumers about the world in all its wonder, diversity and amazement. The network, which is distributed to 88.3 million U.S. homes, can be seen in 224 countries and territories, offering a signature mix of compelling, high-end production values and vivid cinematography across genres including, science and technology, exploration, adventure, history and in-depth, behind-the-scenes glimpses at the people, places and organizations that shape and share our world. For more information, please visit


About Newcastle University

Newcastle University, based in Newcastle upon Tyne, United Kingdom, is a modern civic university with a proud tradition, committed to world-class academic excellence – but excellence with a purpose. Newcastle University is a red brick university and is a member of the Russell Group, an association of prestigious research-intensive UK universities. The University’s international strategy supports our aim to have a strong international community, experience, reputation and impact. The University hosts students from over 120 different countries and staff from over 80 countries with excellent cross-cultural interaction from working with more than 200 overseas universities and institutions. The university has one of the largest EU research portfolios in the UK. The annual income of the institution for 2017–18 was £495.7 million of which £109.4 million was from research grants and contracts, with an expenditure of £483.3 million.


About the British Geological Survey

The British Geological Survey (BGS) is a partly publicly-funded body which aims to advance geoscientific knowledge of the United Kingdom landmass and its continental shelf by means of systematic surveying, monitoring and research. The BGS advises the British government on all aspects of geoscience, as well as providing impartial advice on geological matters to the public, academics and industry. BGS is a component body of the UK Natural Environment Research Council which is the UK’s leading body for fundamental, strategic and applied research and monitoring in the environmental sciences both in the UK and for international projects. The core outputs of the BGS include geological, geophysical, geochemical and hydrogeological maps, descriptions and related digital databases. Scientists at the BGS produced the first comprehensive map of African groundwater reserves. One of the key strategic aims for the next decade is to complete the transition from 2-D mapping to a 3-D modelling culture.


About Post Author

Sammi Turano

Sammi has been a journalist for over a decade, specializing in entertainment, lifestyle, sports and celebrity news. She is the owner of TVGrapevine and Football in High Heels and the Host of Grapevine in High Heels With Sammi.
About Sammi Turano 4707 Articles
Sammi has been a journalist for over a decade, specializing in entertainment, lifestyle, sports and celebrity news. She is the owner of TVGrapevine and Football in High Heels and the Host of Grapevine in High Heels With Sammi.

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