I'm not a big fan of a % indicator. I could see having a few damage reports possible from your DC team. Like:
"Hull seems uncompromised, sir."
"The hull has sustained damage, sir, it appears to be minor."
"The hull has sustained damage sir, and is probably compromised. Deep diving might be dangerous. The only way to tell will be drydock."
"We've taken serious hull damage, no submerged operations are safe. We need to get back to the barn"
The first would be what you'd hear if you took no damage at all yet, or some minor amount.
The second would be if you sustained damage that manifested itself inside the boat.
The third is the same as the second, but above some threshhold, a hole damage template (or equiv damage) is what I would thing..
The forth is above some very critical level.
Anything that right now would make a hole template in the boat should get #3+, IMO. All would have some chance of total failure except undamaged at all.
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