It should be dark gray, but Mr color 335 is specified in the instruction manual of the trumpeter. Mr color 335 is medium sea gray, so I thought it was a little too bright. It is a color that does not look like medium sea gray even if you look at the painting instruction illustration of the trumpeter.
This time I used Mr color 331 dark sea gray.
I was also worried about how the paint was painted around the hatch in the center, but as far as I can see from the actual ship photo, the hatch seems to be dark gray including the sides.