- Ohio class - US' largest: 18,750 tonnes displaced submerged, 170m long, 13m beam
- Typohoon-class - USSR's biggest: 48,000 tonnes displaced, 175m long, 23m beam
- Oscar II-class (Kursk) - 19,400 tonnes submerged, 154m long, 18.2m beam
Water is not to be trifled with.
That’s why I think even though I am only able to swim what 4 meters or something down, maybe less, 100m under the water sounds really little for a submarine. Also probably because I have no experience with submarines so I was imagining that for the most part they would be many hundred meters under the sea level.