engine when the ground crew member was sucked in, in effect, into that engine. the plane's operator, delta airlines, says they are heartbroken over the incident. the ntsb said it is continuing to gather information about what exactly happened there. well, now an immense and large-scale recovery rescue effort has now turned into a tireless recovery operation. the u.s. coast guard says its biggest priority is to salvage pieces of the titan sub that imploded last week, crucial evidence to figure out exactly what went wrong and whether there could be accountability for those five people who died there. who's responsible? cnn's gloria pazmino has the latest on this international investigation. i wonder how the coast guards and others are framing this now. canadians at least raising the possibility of a criminal investigation. >> reporter: yeah. and as far as we know, jim, what the authorities here have told