Cameron hits Challenger Deep , part of the Mariana Trench , a spokeswoman says . The figures exclude microbes , of which a 2010 marine life census estimates there are up to one billion kinds . He 's the first person to dive solo to that spot , the deepest in any of the world 's oceans . Comment:
Cameron hits Challenger Deep , part of the Mariana Trench , a spokeswoman says . He 's the first person to dive solo to that spot , the deepest in any of the world 's oceans . Comment: