With no additional case, the Hero7 is safe to 10m. With a case, you can go much deeper. The default waterproof case that my Hero4 came with is good to 33m (and

With no additional case, the Hero7 is safe to 10m. With a case, you can go much deeper. The default waterproof case that my Hero4 came with is good to 33m (and I've taken it to 33m myself). There's a dive enclosure that's good to 60m. I'm sure there are even better after-market options, but very few people dive beyond 30m. With the case on my Hero4, I wouldn't expect any problems leaving it in a pool for even months at a time. I haven't seen the Hero7 but if it survives an hour it'll probably survive a lot longer, unless something is particularly sensitive to chlorine.