Idea: secret, hidden forward operating bases for refueling and repairs

[Drifter]

I have been thinking about creating a campaign mod that adds 'secret, hidden forward operating bases' here and there in Japanese occupied territory, simulating support by local underground networks and coordination through British agents. Location and availability would depend on the year and month. Player sub would be able repair and refuel at these secret locations. I would probably limit the availability of secret, hidden forward operating bases to just one or two at a time. I have been considering creating a mod like this because of the common problem of player running out of fuel due to damage or mismanagement, and no way of calling for help.

Not sure how realistic or gamey this feature might be, but if anyone is interested in a mod like this, please let me know.