I could use this too. I often go diving and I need a phone for taking selfies and for calling with my girlfriend while diving. My previous phone broken when I tried to pick up under water and since then my girlfriend is pretty angry because I failed to pick up the phone.
So now I need to make it up to her by posting selfies of me diving on facebook.com while diving. She also demands that I put something romantic under it to prove that I love her or she won’t have sex with me. I think this should be pretty easy because I rarely go below 60 meters and I was easily able to find a selfie stick that is waterproof to depths that are far beyond 60 meters. So unless Purism’s Librem 5 lags far behind modern selfie stick technology, the Librem 5 should be waterproof to at least 60 meters depth.