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>You could pull vacuum...

Unfortunately, that would also destroy the LCD and quite possibly the crystal oscillator (not sure how strong the metal can enclosure of those things are). Battery wouldn't survive it either but you could easily take it out and insert it after the vacuuming.

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The metal can for the oscillator surely doesn't fill with oil, and would therefore crush at 1000 psi?

Filling this with mineral oil might actually reduce rather than increase its pressure withstanding ability.

I have no idea how tightly those things are sealed. Given some of the watch tests in this thread (the olive oil one), it surely can withstand the positive pressure but I'm not certain it could withstand negative pressure. If oil got in there, that oscillator would never keep the correct frequency again.

Hopefully someone does some tests.

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