Reach a depth of 500 m
Reach a depth of 100 m
Reach a depth of 1 000 m
Reach a depth of 6 000 m
Reach a depth of 80 000 m
Reach a depth of 30 000 m
Reach a depth of 200 000 m
Reach a depth of 350 000 m
Reach the Earth's Center (500 000 m)