Four decades ago, a couple of young guys hauled a bicycle up Mont Simmerstein in a rugged pocket of the Austrian Alps and attempted to ride down. The mountain — known as the Sea of Rock for its jagged armor of boulders, stones and cliffs — destroyed the bike. Local mountain biker Harald Philipp has attempted the descent many times and failed — pits, technical sections and razor-sharp stones make it a nightmare. In Sea of Rock, Philipp recruits pro trails rider Thomas Ohler in the hope that, by combining their knowledge, they can successfully thread through the wicked terrain. The film follows the riders as they find lines through this imposing and beautiful landscape, chasing the long sought-after goal with two completely different styles.