The empty slots in the bomb rack change position in each shot. Also, after the second underwater rumble, five of the bomb slots are empty even though the rack's gate is still shut. See more
Underwater: That's where I do my work. But one of the most harrowing jobs in my entire experience started fifty feet above the water, when I found myself in a helicopter circling over a sunken ship, which was loaded with deadly explosives. I had to get to that ship the hard way.
[jumps into ocean from helicopter
Getting away from it later was to prove even harder.