Short, normal and long corridor have panels in the floor that can be opened, but there is nothing there to interact with. It would be great if a fuse box could be added, or even shut-off valves or switches for water/air, so that isolating different parts of the base would be possible without requiring a 3-or-4-way connector. Likewise, adding water/air shut-off valves/switches in the 3/4 connectors to the side of the panel opposite the fuse box would be great. Also, add electrical/fluid switches in the Main HQ/Hub for each of the entrances, and in the Capsule Adapter structure for the capsules (together or individually). For a structure in an atmosphere like Mars (or in a vacuum) that would make a lot of sense. So would making sure that only segments with O2/H2O flow enabled would have those things, allowing for work on damaged sections, or to remove sections entirely without causing leaks.
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