30 Meters Down: Brian Grubb eFoils the Shadows of Bluespring Caverns

Two-time world wakeskating champion, Brian Grubb, rides an e-foil at 20 miles per four through America’s longest navigable underground river. The Myst’ry River is 30 meters beneath the surface. The temperatures hover around a consistent 53 °F (11 °C). The world’s first underground e-foil expedition required complex logistics. Full Story: