Removing deep snow in layers and removing snow on both sides of a low-pitched roof as you go.
sinkhole
You run for your life ;)
Caldera
another floor
Shakehole or Sinkhole - when the collapse extends to the surface. (Not all cave roof collapses disturb the surface above.)
A sinkhole is formed when the roof of a cave collapses.
a gable roof is double pitched with vertical ends
A large hole formed when a roof of a cave collapses.
A large hole formed when a roof of a cave collapses.
the roof of the magma chamber collapses forming caldera
A sinkhole forms.
Its called a "caldera".