pressure chamber and also we heard the rov that was assisting the search this morning, this was from verizon arctic into the press conference they are, they provided a few more details about the debris that was awful to tell us more about that. the rare admiral and some of his officials were able to give us more detail of exactly what it was that they have seen on the sea bed this morning. he describes five key pieces of debris for them in the main i think it is the two end caps of the submersible that they've been able to at least get site of on the sea bed, which had given them the confidence to say that is the remains of the submersible and the way in which that debris has fallen to the sea bed gives them a strong suggestion that they keep repeating it is consistent with what they call a catastrophic implosion. that means something sudden, shocking, quite powerful which presumably would have meant certain death for those on board. it appears that this probably happened quite early into that dived down to the wreck of the titanic on sunday morning. we know that communication was lost about an hou