The caves I quoted are some of the most popular caves in France for cave diving. They have much larger main conduits - think garage door up to church-sized. The sumps are long and deep. Vis 5-15m. The dive in, and hence the necessary dive out, are trimix dives with significant decompression. People are now regularly exploring beyond the first deep sumps of these caves and run the risk of injury or kit failure. The GUE teams operating in France are well set up to operate in this kind of environment and the safety setup to deal with a problem is significant. Lots of teamwork involved.
The team at Cabouy are climbing and rigging rope systems beyond a 2km long, 30m deep continuous sump. Beyond that they did 1km of dry caving and then a 100m deep trimix dive. They have built rescue stretchers for the possible underwater evacuation of injured divers / climbers. The list of people able to rescue them from there is pretty short so they took precautions themselves. Map here : http://www.thehiddenriverproject.org...uysse_plan.pdf
Our project accurately surveying St Georges has been more diving orientated so far, but has now reached the start of sump 3 which is shallower and more like caving. Sump 1 is 400m long, 30m deep. Sump 2 is 1100m long, 75m deep. Then there is a section of dry caving/climbing to reach Sump 3. The ability to self-rescue from this kind of area is essential and we have appropriate reserves in place to do so. Map here : https://www.dropbox.com/s/watp4mkphc..._v1.4.pdf?dl=0
Ressel is even more exposed at the far reaches. S1: 3095 m (80m deep); S2: 434 m; S3: 89 m; S4: 5 m, S5: 242 m; S6: 1335 m. http://plongeesout.com/ressel_new.html