Filmmaker James Cameron surfaced three hours earlier than planned Monday after hydraulic fluid started leaking in his sub, as he became the first adventurer to make a solo journey to the deepest point on the ocean’s floor. 
 
 The 57-year-old described diving to a depth of nearly 7 miles in the 12-ton Deepsea Challenger as a “heckuva ride” after resurfacing in the Pacific Ocean, 300 miles southwest of Guam, on Monday morning. 
 
 He said, “It was bleak. It looked like the moon. I didn’t see a fish… I didn’t find anything that looked alive to me, other than a few [shrimplike] amphipods in the water. 
 
 “I didn’t feel like I got to a place where I could take interesting geology samples or found anything interesting biologically,” he added. 
 
 The “Titanic” and “Avatar” director had planned on spending six hours on the ocean floor collecting samples and sent a tweet after reaching the Challenger Deep undersea valley in the Mariana Trench. 
 
 “Just arrived at the ocean’s deepest [point]. Hitting bottom never felt so good. Can’t wait to share what I’m seeing [with] you,” Cameron said in the tweet. 
 
 The descent took 156 minutes, but after he noticed the fluid leak Cameron decided to end the mission early and his ascent took just 70 minutes. 
 
 His sub was spotted by helicopter and he was picked up by the support vessel the Mermaid Sapphire shortly afterward. 
 
 He said, “I saw a lot of hydraulic oil come up in front of the port. The port got coated with it. I couldn’t pick anything up, so I began to feel like it was a moment of diminishing returns to go on. I lost a lot of thrusters. I lost the whole starboard side. That’s when I decided to come up. I couldn’t go any further — I was just spinning in a circle.” 
 
 Cameron hinted that he could carry out another dive to the trench in the future. He said, “Next dive. Gotta leave something for the next one.” 
 
 Others paid tribute to his bravery. 
 
 “@JimCameron has surfaced! Congrats to him on his historic solo dive to the ocean’s deepest point,” said organizers of his mission, Deep Sea Challenge, at 10:03 p.m. ET Sunday. 
 
 Arnold Schwarzenegger, who was directed by Cameron in the “Terminator” films, was among the first to congratulate Cameron, tweeting, “Congrats to my great friend on the deepest solo dive ever. Always a pioneer.” 
 
 Cameron embarked on the solo trip in a sub that he has described as a “vertical torpedo,” outfitted with 3D cameras and a tower of LED bulbs to capture video footage of the alien world, some 35,800 feet below the surface. He also collected samples. National Geographic will chronicle the adventure in 3D at theaters and later on TV. 
 
 In addition to studying deep ocean science, he had been training for the physical challenges of the mission — running several miles a day, practicing yoga and preparing to deal with the sub’s cramped quarters. 
 
 No one has been to Challenger Deep since Jacques Piccard and Don Walsh made the descent in a 1960 expedition for the US Navy. Their stay only lasted about 20 minutes and did not allow for the type of extensive study that Cameron planned. ||||| Media playback is unsupported on your device Media caption James Cameron: "It's a heck of a ride, you're just screaming down and screaming back up" 
 
 Hollywood director James Cameron has returned to the surface after plunging nearly 11km (seven miles) down to the deepest place in the ocean, the Mariana Trench in the western Pacific. 
 
 He made the solo descent in a submarine called Deepsea Challenger, taking over two hours to reach the bottom. 
 
 He spent more than four hours exploring the ocean floor, before a speedy ascent back to the surface. 
 
 His craft was kitted out with cameras so he could film the deep in 3D. 
 
 "It was absolutely the most remote, isolated place on the planet," Mr Cameron told BBC News. 
 
 "I really feel like in one day I've been to another planet and come back." 
 
 This is only the second manned expedition to the ocean's deepest depths - the first took place in 1960 when US Navy Lt Don Walsh and Swiss oceanographer Jacques Piccard spent about 20 minutes on the ocean floor in a bathyscaphe called the Trieste. 
 
 Lt Walsh, who is now in his 80s, joined Mr Cameron and his team of engineers out at sea for the dive. 
 
 "It did bring back a lot of memories, just being out there and remembering what we did there," he told BBC News. "It was really grand." 
 
 Image caption Director James Cameron resurfaced after spending four hours on the ocean floor 
 
 Mr Cameron has spent the past few years working in secret with his team of engineers to design and build the craft, which weighs 11 tonnes and is more than 7m (23ft) long. 
 
 He describes it as a "vertical torpedo" that slices through the water allowing him a speedy descent. 
 
 The extraordinary attention to detail prevented him from suffering from too much nervousness. 
 
 "I can't say that I wasn't apprehensive in the last few days and even the weeks leading up to this, but there's another part of my mind that really understands the engineering and knows why we did everything the way we did," he said. 
 
 "Any apprehension I had I left at the hatch. When I went into the sub, I was all pilot at that point." 
 
 What lurks in the deep? Ocean trench: Scroll 11,000m down 
 
 The tiny compartment that the film-maker sits in is made from thick steel, which is able to resist the 1,000 atmospheres of pressure he experienced at full ocean depth. 
 
 The rest of the vertical column is made from a material called syntactic foam - a solid made mostly of hollow "microballoons" - giving it enough buoyancy to float back up. 
 
 The sub has so many lights and cameras that it is like an underwater TV studio - with Mr Cameron able to direct and film the action from within. He intends to release a documentary. 
 
 It also has robotic arms, allowing him to collect samples of rocks and soils, and a team of researchers are working alongside the director to identify any new species. He says that science is key to his mission. 
 
 But the first task was to get to the inky depths - which despite untold hours of training, still surprised Mr Cameron. 
 
 "My reference frame was going to the Titanic 10 or 12 years ago, and thinking that was the deepest place I could ever imagine," he recalled. 
 
 "On this dive I blazed past Titanic depth at 12,000 ft and was only a third of the way down, and the numbers keep going up and up and up on the depth gauge. 
 
 "You just kind of look at them with a sense of disbelief, and you wonder if the bottom is ever going to be there." 
 
 At the bottom, Mr Cameron encountered incredibly fine silt, which he had to be careful not to disturb. He said he spotted a few small, as-yet unidentified life forms but found the depths to be a "sterile, almost desert-like place". 
 
 Media playback is unsupported on your device Media caption Before the dive, James Cameron told the BBC's Rebecca Morelle why he was risking it all 
 
 While manned exploration had until now seen a 52-year hiatus, scientists have used two robotic unmanned vehicles to explore the Mariana Trench: Japan's Kaiko made a dive there in 1995 and the US-based Woods Hole Oceanographic Institution's vessel Nereus explored the deep in 2008. 
 
 Other teams, such as Scotland's Oceanlab, have also been dropping simple landers loaded with bait and cameras into the deepest ocean. 
 
 While places like the Mariana Trench were once thought to be of little interest, there has been a recent resurgence of scientific interest in the deep. 
 
 Scientists are finding life that can resist the colossal pressures, from deep-sea fish to shrimp-like scavengers called amphipods, some of which can reach 30cm (1ft) long. 
 
 They are also trying to understand the role that deep seas trenches play in earthquakes - these cracks in the sea floor are formed at the boundary of two tectonic plates and some believe the push and pull taking place deep underwater could be the cause of major earthquakes, such as the 2011 quake that resulted in such devastation in Japan. 
 
 But some scientists question whether manned exploration provides the best platform for scientific research. 
 
 Dr Alan Jamieson, from Oceanlab, said: "I think what James Cameron has done is a really good achievement in terms of human endeavour and technology. 
 
 "But my feeling is that manned submersibles like this are limited in scientific capabilities when compared to other systems, mostly due to the fact there is someone in it. Remote or autonomous systems can collect a far greater volume of useful scientific data for far less money." 
 
 Media playback is unsupported on your device Media caption Engineer David Wotherspoon explains how Deepsea Challenger works 
 
 Mr Cameron says he does not want this dive to the deep to be a one-off, and wants to use it as a platform for ocean exploration. 
 
 His craft may also soon be joined by other manned submersibles vying to reach the ocean's deepest depths. 
 
 One of these crafts, the DeepFlight Challenger, belongs to former real estate investor Chris Welsh, and is backed by Virgin's Richard Branson. It is about to begin its water trials. 
 
 Its design is based on a plane, and Mr Welsh says he will be "flying" down to the deepest ocean. 
 
 Google's Eric Schmidt has helped to finance another sub being built by a US marine technology company called Doer Marine. They want this sub to carry two to three people, and are placing a heavy emphasis on science. 
 
 And Triton submarines, a Florida-based submersible company, intends to build a sub with a giant glass sphere at its centrepiece to take tourists down to the deepest ocean for $250,000 a ticket.
– James Cameron's trip to the world's deepest spot sounds a wee bit like something of a disappointment. The six hours he intended to spend at the bottom of the sea—filming and gathering geology samples—was cut in half when hydraulic fluid started leaking in his submersible. As for his time at the bottom, "I didn't see a fish ... I didn't find anything that looked alive to me, other than a few amphipods in the water," he says. "I didn't feel like I got to a place where I could take interesting geology samples or found anything interesting biologically," he noted, according to the New York Post. It took him 156 minutes to go down, but only 70 minutes to come back up after he spotted the leak. "The port got coated" with oil, he said, noting that he lost control of the starboard side of the sub. "That's when I decided to come up. I couldn't go any further—I was just spinning in a circle." But it sounds as though he's planning to go down again: "Next dive. I gotta leave something for the next one," he said. (But hey, at least he's alive. Gizmodo rounds up five ways he could have perished, and they don't sound fun.)