Salt water safe magnets

[msjboy]

Used hard drives has rare earth magnets.... Cannibalize them and encase them if yiu can. I think dealextreme.com has some too which you can try out to see if they are strong enough or if they can be encased somehow.

Good luck.

[mark]

Lee Valley carries the rare-earth magnets. As said might be able to protect with a epoxy or resin coating.