Well i reach to tweak many things. Hull hitpoints, bulkhead hitpoints, individual compartements hitpoints, flooding start, reapir speed.
But there is a law, when your bulhead take damage, your crush depth is reduced, itrise up some meters, simulating a stressed hull.
In my last test mission, using a Salmon with an adjusted crush depth of 114 meters, i take damage on bulkhead, red bar was not full, it was under the 50%.
I evade the 2 Akizuki, go far away, and reapir all reparable items.
Then i sail on surface many hour to permit any hidden bulkhead maintenaince.
Attempt to dive to peri depth, all OK. I sail 12 hours at peri depth, go to surface.
I was detected by another 2 anoying Akizuki. i performed a crash dive.... 40m, all OK, they attacked me, take some more damage, then i go to 50m, all OK, then i go under the thermal layer.... 60m, all OK. And evade them.
Sail on surface many hours, about 12 hours.
All reparable damage reapired.
then dive to 60m, sail there many hours at 2knots, all OK.
then go to 70m... sail at that depth many hours, all OK.
then go to 80m, my crush depth is 114m..... after few minutes.... domino effect, spining camera and sub sinks....
A small damage in my bulkhead reduce my crush depth in 34 meters.... about 30%.
There is a realtionship between the bulkhead damage and the crush depth reduction in some place but cant found it... :hmm:
May be hardcoded ?
The only way i can see up to ate, is to make the bulkhead more strong, and the depth charges powerless.... to reduce the probability of the domino effect, and reseve it for when you take really severe damage only.
Really, we need some kind of advice, in example the bulkhead item box, become yellow, orange or red indicating some kind of level of stress in the hull.
In real life, a crew sure will say you ...
"captain, we have the ribs reinforced with woods, dont dive beyond peri depth...!!!"
Still researching....,
