My guess is that they are using that sub to practice rescue missions on using DSRVs. That is the only answer I can think of, where you would want to have bumpers both fore and aft (if they were transporting a DSRV, you would likely only see bumpers on the aft portion, as most nations transport DSRVs aft of the sail, not to mention the lack of room forward of the sail for one. I also do not see any mountings for anything. It would also explain the brightly colored hatches
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