[Huan]

I saw an article in diver-girl or some such mag last summer.
Some Scandinavian with too much time on his hands had built a Pneumatic with a laser sight attached. cost was in the order of £300-400stg so I passed.
I suppose it is a good idea in theory, however I have the following questions,
1, How easy is it to waterproof a laser pointer to 30m?
2, How easy is it to fit a switch to the above mentioned and still have waterproofing?
3, What range would you zero the gun at?
4, What does plankton/marine snow do to the dot?
just a few ideas.