Description of The Green Chapel

The poet describes it as a low, smooth mound covered with grass, with openings at the ends and the sides, indicating that it is oblong. This description makes the Green Chapel sound like a barrow, an ancient grave mound, which has been emptied of it contents, so that it looks to Gawain like nothing but an old cave.

ok if it wasn't the hans one it was probably c or he thought the mountain was collapsing on them.