AtlasInterlaken

Trummelbach

verified Ungraded Unknown flood risk Lauterbrunnen, BE
Trummelbach
JoachimKohler-HB, CC BY-SA 4.0, via Wikimedia Commons

The lower run of the Trummelbach Falls system, staged from the same car park as the tourist walkways, with a third of the descent in total darkness.

There's no real escape until past the halfway point, where a few homemade anchor hooks bolted to the tourist viewing platforms could serve for an emergency ascent, nothing more. Ropewiki calls for a full wetsuit, thick gloves, and a genuinely waterproof case for your headlamp as baseline kit. First descended in 2000 by Andreas Brunner and party. Sources disagree on the biggest rappel: the infobox lists 55m, an older trip note says 46m; rig long and check current beta before committing.

Logistics

PermitRequired, verify with land manager
Distance470m
Time5 hr
Technicallongest 55m
SeasonAutumn
Coordinates46.5679, 7.916

Sources