S-31 wreck lies at around 70 m depth in upright position on the sandy/silty seabed. This is a boat dive for technical divers. The wreck is about 33 m long and 5 m in beam. Schnellboots were made of aluminum frame covered with mahogany planking, and the wooden casing of S-31 has rotted away leaving only the metal frame. Otherwise the WWII wreck still is fully intact with its original weaponry for divers to explore: the three engines, triple propellers and rudders at the stern, twin torpedo-tubes at the bow with torpedoes ready for launching, and the anti-aircraft machine guns still standing.