[r9etb]

I suspect that any radioactive contraband was tossed over the side on entering the bay.

That wouldn't make sense. They'd know they had to be inspected, and would have been hoping to slip through. To just toss it overboard would have ruined the mission.

IMHO, any jettisoning would have been seen and noted.

[crypt2k]

IMHO, any jettisoning would have been seen and noted.

There would always be opportunities. Depends on the material, timing, lighting, crew factors, etc.

[piasa]

Here's that link to the targetting of ships with nuclear material in the far east.