Calc GaoGaiGar - Machine Primevals vs GGG

The Primeval Machines attack GGG, creating a colossal explosion of water. The Primeval Objets are 145m tall.
118 pixels = 145m
1 pixel = 145m/118 = 1.22881356m
1.22881356m X 956 = 1174.74576m
1.22881356m X 1490 = 1830.9322m
1830.9322m/2 = 915.4661m

Volume as half an ellipsoid.

V = 4/3πabc
= 4/3 X π X a X b X c
= 4/3 X π X 1174.74576 X 915.4661 X 915.4661
= 4.12398455e9/2
= 2061992275m^3

Water weighs 1000kg/m^3.

M = 2061992275 X 1000kg
= 2061992275000kg

Timeframe is 1 second and 6 frames.

T = 1s/24
= 41.6666667ms X 6
= 0.25s + 1s
= 1.25s

T = 1174.74576m/1.25s
= 939.796608m/s

At last, we can find our kinetic energy!

KE = (0.5)mv^2
= (0.5) X 2061992275000 X 939.796608^2
= 9.10594001e17 joules
= 217.63718953154875635 megatons

Final Results
31 Primeval's attack GGG = 217.637 megatons