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I have found a Cache 800m below sea level GC38TF7 "Kristallgrotte Merkers Teufe 800 Meter".
But my stats say lowest elevation is -4 m. Head-in-the-grounds-award is also not updated. Whats wrong, what can I do?
800 meters under the ground is not 800 meters below the sea level. On the map, I see the cache on the altitude of 250 meters above sea level and that is the value Project-GC is using.
Please, read the FAQ on the page: PGC does not do manual modifications of the altitude of caches, neither if they are in deep mine nor when they are on high tree or lookout tower. The altitude used is always the one that is collected from available sources.