Trümmelbach Falls are Europe’s largest underground falls. Ten waterfalls (meltwater of Jungfrau Glacier) cascade down the ravine and subterranean mountainside.
You actually stand inside and among the subterranean falls as the water rushes past you over 1300 feet to the valley floor.
The falls lie between Lauterbrunnen (1.7 miles) and the town of Stechelberg (1.8 miles) in the Lauterbrunnen Valley adjacent to the main road that bisects the valley.
The Falls are generally open daily from the beginning of April until November from 9am until 5pm – and in July and August from 8:30 until 6 pm.