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The Mariana Trench Adventure
Season 03, Episode 17
Mariana Trench Adventure (Special).mp4 000094480
Air date 27 May 2013
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The Octonauts assemble Tweak's new Deep Sea Octolab and lower it to the deepest part of the ocean, the Mariana Trench, where Shellington and Dashi intend to study the sealife. Whilst the Octonauts are setting up the base it is invaded by some giant isopods and other creatures which are looking for a new hydrothermal vent to live around. They also observe some sea cucumbers and luminous sea stars, and whilst chasing an out of control Octobot robot, Kwazii has to avoid undersea mud volcanoes which have created a lake of hot mud on the seafloor. 
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Creature Report

Giant Isopod