descent. we have to make sure that we are looking at both the surface, using the aerial, and surface vessels. but then expanding into underwater search as well. right now, our capability is limited to sonar. we have been listening for sounds, but we are working very hard to increase the capability. this rescue is a race against time, on its website, ocean gate expeditions, that company that operates the submersible on expeditions down to the titanic. says the 31 foot vessel has up to 96 hours, four days of oxygen for five people. one signal rescuers could be looking for? does it have any of the normal pieces of the unit. like the submersible should have. releasable beacon that would have gone to the surface and could have been sending out a signal? what could ve gone wrong? cnn s weather team says the weather in the area was not overly harsh at the time the vessels submerged. but below the surface, currents