Whats at the bottom of the Mariana Trench?
The expedition conducted in 1960 claimed to have observed, with great surprise because of the high pressure, large creatures living at the bottom, such as a flatfish about 30 cm (12 in) long,[24] and shrimp.[40] According to Piccard, "The bottom appeared light and clear, a waste of firm diatomaceous ooze".[24] Many marine biologists are now skeptical of the supposed sighting of the flatfish, and it is suggested that the creature may instead have been a sea cucumber.[41][42] During the second expedition, the uncrewed vehicle KaikÅ collected mud samples from the seabed.[43] Tiny organisms were found to be living in those samples.
In July 2011, a research expedition deployed untethered landers, called drop cams, equipped with digital video cameras and lights to explore this deep-sea region. Among many other living organisms, some gigantic single-celled foraminiferans with a size of more than 10 cm (4 in), belonging to the class of monothalamea, were observed.[44] Monothalamea are noteworthy for their size, their extreme abundance on the seafloor, and their role as hosts for a variety of organisms.
In December 2014, a new species of snailfish was discovered at a depth of 8,145 m (26,722 ft; 4,454 fathoms), breaking the previous record for the deepest living fish seen on video.[45]
During the 2014 expedition, several new species were filmed, including huge amphipods known as supergiants. Deep-sea gigantism is the process where species grow larger than their shallow-water relatives.[45]
In May 2017, an unidentified type of snailfish was filmed at a depth of 8,178 metres (26,800 ft).[46]
Source = https://en.wikipedia.org/wiki/Mariana_Trench
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