Regarding (1), any nuclear weapons may just remain on the sea floor.
For one, we've had nukes lost before by accident (called a "broken arrow" incident in US military) and its estimated around 50 have been lost at sea and never recovered[0].
The thing is, water is a really good radiation shield, and nuclear weapons must execute an extremely precise series of actions to detonate.
For one, we've had nukes lost before by accident (called a "broken arrow" incident in US military) and its estimated around 50 have been lost at sea and never recovered[0].
The thing is, water is a really good radiation shield, and nuclear weapons must execute an extremely precise series of actions to detonate.
It may actually be safest to just leave them put.
[0]:http://www.aerospaceweb.org/question/weapons/q0268.shtml