Where Do You Think I Can Buy An Impermeable Or Underwater Clock With Voice Recorder?

Hallo to all.

I am looking for a good impermeable or underwater clock with voice recorder function, even like that one of the cellular phone, where you click a button and it register, but I can't find it.

I bought something like that, the casio DBV 3000, but it wasn't impermeable .

I bought a chinese one too, it says "water resistant", but when you go under the water a few humidity passes and the contacts are oxidized therefore it doesn't works anymore.

Anyone knows a truly impermeable or water resistant model?

Any suggestion or link?

Thanks to anyone that can help me.

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