MRC
·But when you shower, it is usually with fresh water, so all of the advantages of a Seamaster are lost. In fact, you are extra screwed if you wash with shampoo and soap, as that makes the molecules of fresh water slipperier, and the water will slide right into the case. Showermasters do not rely on the force-field mechanism that Seamasters use, and are designed by Omega to resist the influx of slippery water molecules.
Ah but suppose @vadimo showered in heavy water? The higher density than regular water might attract more soap molecules to the point where they'd disrupt the force-field and not get through.