I was just starting to try this sub out in a singleplayer campaign, and when starting on station the way back into the submarine on station is locked. There seems to be no way to get back on this submarine when docked at a station. I tried undocking, which spawns the crew inside and then flipping the switch for that lock toggle and redocking, it didn't seem to affect it. Not sure what the problem is though.

Edit: An update, I tried to use the bottom aux airlock for an entrance when docked at station. Swam out the side doors from the station dock and then around the sub to the bottom and it was able to be opened. I checked command room and the airlock was unlocked, according to the switch light. I was able to go out through the top airlock from inside, and then once I got beyond that hatch I was able to press the button to close it again, and then the hatch was inaccessible. No mouse-over interaction, can't use crowbar or screwdriver and the plasma cutter doesn't even phase it, no health bar shows up. It seems to work how it's supposed to when not docked at station, I hope that helps narrow down whatever is causing the issue.

Originally posted by Vince Vaughn:

I was just starting to try this sub out in a singleplayer campaign, and when starting on station the way back into the submarine on station is locked. There seems to be no way to get back on this submarine when docked at a station. I tried undocking, which spawns the crew inside and then flipping the switch for that lock toggle and redocking, it didn't seem to affect it. Not sure what the problem is though.

Hi, thank You for bringing this to my attention! I don't know if its recent, but it appears that hatches with embedded buttons became/are almost impossible to interact with when you're docked.

I patched it by changing the buttons to custom buttons and wiring the hatch toggle myself. It should work as advertised now and you should be able to interact with the buttons that open the hatch even from an outpost. Sorry for the inconvenience.

TL;DR:
Should be fixed now, thank you for the feedback. If you encounter any other bugs I'll be glad to adress them.