Now that I see the difference with the new movie, TOS Enterprise
is equivalent to an old German u-boat. It's a tin can in outer space. They had no right going out into deep space in such a tiny ship.
The thing was three hundred
meters long, man. People don't seem to grasp how huge that is in terms of volume.
The hull breach takes up half the thickness of the saucer rim, and there is one deck visible.
I'm sorry but that is false. First, the picture's very dark, but that is not half the thickness, there.