Cave of Death (Mercury Tunnel)
Cave of Death (Mercury Tunnel)
Tips
September 30, 2019
Hiking
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July 13, 2025
Hiking
Tucked away in the hillside is this former tunnel, once used to extract mercury, now known as the "Cave of Death." Poisonous gas (including mercury vapor) constantly escapes from within, making the cave extremely dangerous. A fascinating, yet threatening, site of geological and historical significance.
Tip: Never enter! Even a few breaths in the tunnel can be life-threatening. Observe only from a safe distance and treat the area with respect.
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Nearby routes
Best routes near Cave of Death (Mercury Tunnel)
4.8
(5)
18
hikers
15.3km
04:42
470m
470m
Moderate hike. Good fitness required. Mostly walkable paths. Sure-footedness required.
5.0
(1)
4
hikers
8.17km
02:20
200m
200m
Moderate hike. Good fitness required. Easily walkable paths.
2
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8.03km
02:18
200m
200m
Moderate hike. Good fitness required. Easily walkable paths.
Details
Informations
Elevation 360 m
Weather
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Thursday 5 November
7°C
-1°C
11 %
Additional weather tips
Max wind speed: 4.0 km/h
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Location: Rathsweiler, Kusel, Palatinate, Rhineland-Palatinate, Germany