Divers dive with no pressure protection far, far deeper, certainly as deep as 100m and beyond. If the station floods but they have air to breathe, then that's fine.
However, they are doing saturation diving. This means their bodies are full of dissolved nitrogen, which, if they were to ascend to the surface over any shortish frame of time, would regassify and kill them - that's "the bends". When ascending grona saturation dive, it takes hours to days, depending on depth, to surface.
So if the station floods and they each have a scuba kit, they still can't surface and are potentially in trouble.
If there is a hole, the things that matter are the outside pressure and resistance to water flow. The latter is mostly viscosity I'd think and very little to do with air pressure on the inside. Whereas water pressure is 3x surface.
That said 19m is really not that deep, I don't think it would be dramatically different to a leak closer to the surface. Some ships have draft of like 15m and, while generally holes in hull are bad, I'm not sure that this is some kind of special design precaution. But I wouldn't really know.
If they can get the scuba gear on and attach themselves to something (rope between buoy and seabed etc) so they can control their ascent up, they could still decompress as long as they have enough new oxygen supplies being brought in.
Divers dive with no pressure protection far, far deeper, certainly as deep as 100m and beyond. If the station floods but they have air to breathe, then that's fine.
However, they are doing saturation diving. This means their bodies are full of dissolved nitrogen, which, if they were to ascend to the surface over any shortish frame of time, would regassify and kill them - that's "the bends". When ascending grona saturation dive, it takes hours to days, depending on depth, to surface.
So if the station floods and they each have a scuba kit, they still can't surface and are potentially in trouble.