> 100m relative to what? You quoted it yourself: "the sea level of the Indian Ocean over the hole is a whopping 106 meters lower than the global average" We

> 100m relative to what? You quoted it yourself: "the sea level of the Indian Ocean over the hole is a whopping 106 meters lower than the global average" We already know that sea level isn't a uniform height. If it were tides wouldn't be a thing. The various ocean's waters are going to be at different levels. > i mean isn't sea level always 0m by definition? You could make the same argument for ground level but we know that's not uniform.