Hacker News Reader

This video might be of interest to you-

https://www.youtube.com/watch?v=iOT8XU1ss3E (Do Oil-Filled (Hydro Mod) Watches Actually Dive Deeper?)

A very similar model (A158 — they differ only in the bracelet) breaks at 200 m:

The timekeeping mechanism keeps working fine, though, it's only the display that's busted.

Yep would have loved more on when the watch (unmodified) would actually break and also how you would fill it with oil? There can't be much space inside, at what point does the viscosity of the oil matter? how do you know you've got all the air out?

I'm assuming they are using mineral oil; I've not filled a watch with mineral oil, but I have worked with it. Mineral oil is not particularly viscous; some gentle tapping is probably enough to get all the bubbles out.

Here's a video of a PC immersed in mineral oil with an aquarium bubbler and you can see the bubbles rise fairly quickly:

https://www.youtube.com/watch?v=tUBvWXH1hLs&t=110s