You don't see the hitbox, but you could draw it.
See here: http://worms2d.info/User:Etho/Physics_Engine There's worm collision mask drawn at the bottom of the page. Now the worm's sprite rotates during gameplay, but collision mask doesn't (I don't recall the source of this info). By comparing screenshots of the game to a picture of collision mask, I think it's perfectly possible to find out what bit of land it touched.
See here: http://worms2d.info/User:Etho/Physics_Engine There's worm collision mask drawn at the bottom of the page. Now the worm's sprite rotates during gameplay, but collision mask doesn't (I don't recall the source of this info). By comparing screenshots of the game to a picture of collision mask, I think it's perfectly possible to find out what bit of land it touched.