This might give you some anxiety.
Does watching this video make you panic? Don't watch if you're claustrophobic.
Professional wingsuit pilot Alexander Polli attempts to fly through a narrow cave no wider than he is tall. He reaches speeds of 155 mph while following a precise trajectory leading to the cave opening. INSANE!
You'll never believe what this couple comes across while spelunking deep in a cave.
This homeless mans head is caved in.