Hi!
Isn't it just a shame that Omega doesn't talk about stuff like this in their telephone-directory-thick instruction manuals? were all supposed to be degree level watchmakers.
Ive owned Speedmasters and Bond Seamasters. Have never owned a Planet Ocean. However, it has very large gaskets in it to ensure watertightness(as I've been led to believe, the screw on the crown doesnt really stop water getting in).
So, down to the specifics.
Was your watch directly under the water stream? It largely depends on the pressure of water as watches are tested at static pressures(god alone knows why!!). In truth, people on here go swimming with their Speedys with a measly 50m protection and no screw down with no problems. Also, the helium escape valve has some water resistance when unscrewed.
Gut feeling? I think it'll be ok. However, you might want to fess up and get a watchmaker to look at it.
It can happen and you can't be an expert on watch care with everything.
Also, Omega states that it is resistant to a "lung bursting 600m". If a power shower damages it, I think it's a bit poor.
Shower gel is however the enemy of all gaskets!!!!
Things to watch out for? Condensation on the glass and losing time.
Now put it on your wrist, and watch Quantum Of Solace!!!!
Regards Joseph.