Hole possibly a tear in snail! Help!

[mcduff]

Yesterday I noticed this hole thing in my snail. I don’t know how old he is as I’ve only had him a month and rescued him. He’s still eating and drinking still very active had him out this morning and was moving around. I’m very concerned as I have two snails living together neither have had eggs yet. Any help or advice would be great.
It looks like hole between his shell and him that opens and closes when moving around I’m not sure how to upload photos onto here

[wolf]

Hi,
sorry, but could it be the breathing hole/pore (= Pneumostome)?
Kind regards: wolf