The deepest regions of the oceans still remain one of the least explored areas on Earth, despite their considerable scientific interest and the richness of lifeforms inhabiting them. Two reasons for this are the low temperatures and enormous pressures exerted at such depths, which require the exploration equipment be carefully shielded inside high-strength metal or ceramic chambers to withstand them. This makes deep-sea exploration vessels bulky, expensive and unwieldy, as well as difficult to design, manufacture and transport. But a new small self-powered underwater robotic fish appears to offer an alternative. According to a recent paper, the robot was able to reach the deepest part of the Pacific Ocean – the Mariana Trench – at a depth of almost 11 km (6.8 miles).

Toxic man-made mercury pollution has been discovered in the deepest part of the ocean, in the Marianas Trench -- more than six miles below the surface. Researchers from China and the US used submarine robots to identify mercury in the fish and crustaceans living in the deepest part of the western Pacific Ocean. Mercury enters the atmosphere through the burning of fossil fuels, mining and manufacturing. It can then be transported into the oceans via rainfall. The liquid metal -- which was once used in thermometers before being banned -- is highly toxic and can be ingested via polluted seafood.

Breathtaking drone footage captured above Kīlauea has revealed the dramatic changes taking place as the Hawaiian volcano continues to spew ash and gas from its summit more than a month into the current eruption. The flyover mission led by the US Geological Survey and Office of Aviation Services on Thursday aimed to investigate the activity within the Halema'uma'u crater, which has been subjected to rapid changes as Kīlauea rumbles with explosions and small earthquakes. As scientists remotely explore the area using unmanned aircraft, the volcano has shown no sign of letting up; just this morning, it launched a plume 6,000 feet above sea level in yet another explosive event. Putin denies Russian interference in the U.S. election Trump repeats'zero collusion' message after meeting with Putin Kīlauea's summit has been steadily caving in as activity continues, bringing the huge pit crater down with it. The footage captured on June 13 shows how the steep crater walls have slumped in toward the center; now, scientist say the deepest part of Halema'uma'u sits at about 300 m (1,000 ft) below the crater rim.

Breathtaking drone footage captured above Kīlauea has revealed the dramatic changes taking place as the volcano continues to spew ash and gas from its summit more than a month into the current eruption. The flyover mission led by the US Geological Survey and Office of Aviation Services on Thursday aimed to investigate the activity within the Halema'uma'u crater, which has been subjected to rapid changes as Kīlauea rumbles with explosions and small earthquakes. As scientists remotely explore the area using unmanned aircraft, the volcano has shown no sign of letting up; just this morning, it launched a plume 6,000 feet above sea level in yet another explosive event. Look at The Boring Company's high-speed underground transport system Oh deer it's the piddling pool: Animals take over family's garden Kīlauea's summit has been steadily caving in as activity continues, bringing the huge pit crater down with it. The footage captured on June 13 shows how the steep crater walls have slumped in toward the center; now, scientist say the deepest part of Halema'uma'u sits at about 300 m (1,000 ft) below the crater rim.