the pentagon? any sense for how this happened? >> a lot of bewilderment. this doesn't happen. the navy doesn't have these kinds of catastrophic collisions at sea. what we're learning is how catastrophic it really was. think of what this crew was facing. it was dark. they had been in a collision. water is pouring into the ship, both beneath the waterline. they have damage above ground. the container ship and the navy ship hit exactly where the berthing compartment was and where communications were. the ship lost communications on board, dark, trying to struggle to survive, to save the ship and can't even communicate properly with each other. it was a catastrophe that befuddled everyone now, how it happened, but it will be fully investigated. >> john, help the rest of us to understand. aren't there radar systems on