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Last year the guys that went in went int the round hatch in the bow; and turned around at the conning tower and returned. This year they entered somewhere in the stern [I think] and ran down to the bow. I was only planning a little 'duck in the round hatch, go through the bulkhead, pop out the square hatch'., so I didn't spend much time thinking beyond that.
Of course, another question... we're basically talking about the round hatches that make it tough for doubles, right? (after all, the profiles with doubles for square hatches wouldn't make a difference - same as with a single)