what is a good digital camera for underwater photography?

Pentax makes a the Optio W30, which is waterproof and can go underwater. It's also relatively inexpensive.

Otherwise, you'll have to purchase a regular digital camera and then a separate underwater housing for it. The housings can often cost more than the camera itself.

Look at the Canon A570 IS and the Canon WP-DC12 underwater housing if you want a suggestion other than the Pentax.

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As above. Meaning the Pentax. Shame about the other 2 idiots.

Good luck.............

a waterproof one

panisonic

as above lol