You might consider the 99,9% other options, but you definetly dont rule out the worst case scenario, unlike what a lot of people in this thread are doing..
No one is ruling it out. They're saying it's not likely enough to justify the level of stress and panic the OP felt. It's this stress and panic that led him to ignore the captain's questions and focus 100% on freaking out about his buddy dying at the bottom of the ocean.