pretty sure i didn't stranded, if you strand (yes i had that before) then the "endclip" shows your nice little sub on a beach.
After a 7th time reloading the game i decided to wait moving, didn't change my travelpath... just waited 2 day's, increasing the time speed ofc, then tried again and... 30 minutes later RL time) i got another huge europian liner on my killstreak with 2 destroyers
game just continue's as it did before
so, no idea what or why... but it is there, no idea what it causes tho, thats all the info i can provide on my part.