Hmmm odd
Am runniing a type 7a and set the cfg to 8 mtrs
When set depth to 6m still have bridge crew and diesels
When set to 7m have crew and electrics
Set to 8m and have no crew and electrics
Looks like may be a discrepency somewhere
Note when depth says 5m depth gauge usually says 4.5 or there abouts
Had no trouble surfacing either using S key - straight back up to 5m
Will test some more