Nothing. I stumbled across a TV program a while back (not sure which channel, maybe NatGeo, or H2) where they interviewed a retired guy who spends his time looking for the bomb. He says that he is under strict instructions not to disturb it (duh!) if he finds it, and to alert the authorities so they can fetch it.
Originally Posted by Ilya
He says his motivation is to prevent the bomb from falling into the wrong hands, and has no problem with leaving the recovery to professionals. The bomb is assumed to be buried deep in silt, so I'm not sure how he can determine if he has actually found the bomb to any level of certainty without disturbing it.
There is also some debate whether the bomb has a plutonium pit installed. So, if you find it, you may have to order some parts to get it operational.
I may have many faults, but being wrong ain't one of them. - Jimmy Hoffa