Dissecting One Piece Scene #2
The first question I’ve already answered here
This is the answer for @chromatic-lamina ‘s question about the pressure of the Polar Tang submerging might affect if anesthesia or anything else was administered? AAAAA interesting topic and question yes! Because at first, I thought there are some limitation for human body in submarine.
Let’s take a look, this is Polar Tang.
Heart Pirates’ Submarine, very interesting, because as we know the only submarine in One Piece world that revealed I suppose? Please correct me if I’m wrong, I’m open to any discussion! To know more about Polar Tang’s terminology and meanings @tackyink already explained it very clearly and splendid on her post here.
First and foremost this is the design of the submarine:
(source)
Sub has an outer hull and a pressure hull. The hull of the sub creates a pressure container, so the outside pressure doesn't affect the inside pressure.
By these facts I personally think that there's no problem for the administration of the medication/anesthesia in the submarine while submerging.
Submarine usually submerged in the water for 2-3 months with crew in it.
Luffy and Jinbe’s medication (such as oxygen for premedication before operation can be administered without problem in Polar Tang).
Another interesting facts I found when I did my research, they usually don't operate in the submarine because there is no enough room for operation and equipments for operation, you can watch the video about submarine medicine by Captain, Raymond Woolrich, here:
Once again, thank you HS @chromatic-lamina for such interesting question. If you guys want to read more about submarine structures this article might help. I open to any kind of correction and discussion, my askbox and message are always open. Have a great day and please stay safe everyone!













