A rockbreaker breaks into the Tanuk arena, throwing up boulders and logs on the way in so the rebels can attack (at high speeds too). The average height of a person is 1.7m.
1 pixel = 1.7m/111 = 0.0153153153m
0.0153153153m X 546 = 8.36216215m
8.36216215m/2 = 4.18108107m
0.0153153153m X 508 = 7.78018017m
Volume as a cylinder.
V = πr^2h
= π X 4.18108107^2 X 7.78018017
= 427.284072m^3
The hole is empty and even while deep underground the surface above is being torn apart with rocks and logs being thrown in the air, which I think more than justifies violent fragmentation (violent fragmentation of rock being 69000000 joules/m^3).
E = 427.284072 X 69000000
= 29482600968 joules
As impressive as this is, this is just when the hole the rockbreaker makes when it enters the Maw Arena. It had dug into it from outside. Thankfully, the Horizon Forbidden West in-game map shows us an overlay of the arena and the path the rockbreaker went through. The Horizon Forbidden West in-game map has a total size of 24km^2, with a height of 2800m and a width of 8700m (although the explorable area of the game is just 16km^2).
Horizon Forbidden West Full World Map
This page contains the full Horizon Forbidden West World Map! View the full in-game map of HZFW including the total map size revealed.
1 pixel = 2800m/1638 = 1.70940171m
1.70940171m X 24 = 41.025641m
1.70940171m X 49 = 83.7606838m
Volume once again as a cylinder.
V = πr^2h
= π X 4.18108107^2 X 83.7606838
= 4600.09991m^3
E = 4600.09991 X 69000000
= 317406893790 joules
Finally, we'll add the two together to get out final results.
E = 29482600968 + 317406893790
= 346889494758 joules
= 82.9085790530593 tons of TNT
Let's also get the amount of energy it would take to burrow per second.
332 seconds.
E = 82.9085790530593 tons of TNT/32
= 2.5908931 tons of TNT
Final Results
Rockbreaker burrows into the Maw Arena (energy per second) = 2.591 tons of TNT
Rockbreaker burrows into the arena (total energy) = 82.906 tons of TNT