Ok, this is a small and insignificant point in my current WIP, but I would like to get it right! An older character is describing to a younger man what life was like on a PT boat (US , Elco class) during World War II. US PT boats carried 2 pairs of 50 caliber machine guns, mounted in two (for want of a better description) "open turrets".

Now, how did someone get into that "open turret"? I see no exterior indications of ladders or other means to enter. I supposed one could have climbed in but such would be very awkward. Was there an entrance below deck? Does anyone know?

Thanks in advance!