- Command room periscope now switches to a searchlight next to the depth charge to actually view bomb drops (front searchlight remains as a stationary light source)
- When you now open the docking hatch from outside, both inside doors are closed to prevent accidental flooding (same function as when you press the inside button)
- Moved the ballast pump next to medical bay further right to prevent visual errors
- Several minor decorative fixes (most importantly, you are now able to fully see the outside docking hatch button whilst docked)

Improvements of Mk. II towards Mk. I:

- Added an additional ballast room
- Added an airlock towards middeck ballast
- Added a decorative antenna unit
- Fixed several sprite depths, primarily outer hull
- Tweaked siren at upper hatch to keep ppl sane whilst docked
- Misc. decorative/loadout improvements