It's a bird! It's a plane! It's ... a crazy man in a wingsuit flying through a cave! That's right: Norwegian-Italian thrillseeker Alexander Polli sprang from a helicopter wearing a "wingsuit" — a specialized jumpsuit that increases the wearer's surface area — and streaked through the narrow opening of a cave not much wider than he is tall. Polli reached a speed of 155 mph (250 km/h), according to the video he released. The aptly-named Batman Cave is located in the Roca Foradada Mountains in Montserrat, Spain. Polli claims to be the first person to fly on his own power "through a narrow cave on a rugged mountainside," GrindTV.com reported. Let's hope there weren't too many failed attempts!