I'm using this checker for my challenge:
https://project-gc.com/Challenges/GC8V4JD/52163
Now it turns out that
https://coord.info/GC19GK9, which is at -4831 m, is not approved by the checker because the lowest altitude band is -1000 - -25 m. Could you please change this and set the lowest value to -10000 meters?