Slitherine

I do not know why, GS 3 is crashed in this situation. Italian BB tries to save itself back in the Red Sea but the hex is occupied by an friend transport.

Well a a naval can not enter a another surface unit's hex. You would have to move the transport off of the loop hex first.

A surface naval unit can enter a hidden sub hex if it is a sex hex.

You need to post the error message you get so it's possible to see where in the code it crashes.

Sorry, I'm not an expert in software. But if you think it is important, I can upload the file namegame.data

Getting the namegame.data file would be very valuable.