Won't be able to post links due to copyright issues, but you can either Google it yourself or buy HBO Max
Godzilla opens tunnel to Hollow Earth[]
Earth diameter: 441 px
Hollow Earth diameter: 91 px
Radius of hollow earth:Radius of Earth = 91:441
Hence, distance from Earth surface to Hollow Earth boundary = 6371000/441*(441-91)
I originally thought it was less, but now I realised cinematic timing takes about 2 minutes (although it's unclear if the events are simultaneous).
But anyway it should be used as a low-ball.
6371000/441*(441-91)/120 = 42 136.24 m/s, Mach 123.82, Massively Hypersonic
Edit: Someone in the CRT measured 2m59s instead, which would make it Mach 83.01 or High Hypersonic+
Scales to their reactions and combat speed, but not movement speed. Although Kong outran it, he only outran the speed Godzilla moves his head to change the direction of the beam, and never outran it directly coming at him, if you get what I mean.
The average gorilla is 1.6 m tall with an armspan of 2.45 m. Kong is 102 m tall in this movie. So 156.1875 m armspan.
Measuring the armspan there was a bit hard but I split it into four segments and combined them and got 360 px. Bad perspective as well, but the diameter at where Kong was at in that shot is approximately 506 px. If someone has a better shot to suggest to scale feel free to let me know in the comments.
506/360*156.1875 = 219.53 m
pi*219.53^2*(6371000/441*(441-91))*1e6 = 7.6555199e17 cm^3
He did it in about 2 minutes as I said.
Pulverization: 7.6555199e17*214/120 = 1.3652344e18 Joules, 326.30 megatons, Mountain level
Vaporization: 7.6555199e17*25700/120 = 1.6395572e20 Joules, 39.19 gigatons, Island level
EDIT: Using 179 for the vaporization end instead, we get 26.27 gigatons
Big monke leaping on fours[]
During the scene in the Hollow Earth, Kong leaps around on all fours when moving forward. I can't really find a good shot for scaling since the camera pans around, but his hind legs seem to move to the position of his fore legs when he leaps in about one second, which is approximately equivalent to the length of his torso.
There's a nice shot here https://hips.hearstapps.com/hmg-prod.s3.amazonaws.com/images/godzilla-vs-kong-king-kong-1614031050.png?crop=0.645xw:1.00xh;0.168xw,0&resize=480:*
Full height: 332 px or 102 m
Torso: 141 px or 43.32 m
So 43.32 m/s, Subsonic.
Big monke running[]
When Kong emerges from the Hollow Earth to face Godzilla, he charges towards Godzilla in 5 seconds.
Using the same picture as above for scaling, his head is 84 px, so 25.81 m.
Head: 87 px or 25.81 m
Distance: 765 px or 226.95 m
226.95/5 = 45.39 m/s, Subsonic
Big monke swinging[]
One second jump from building to building. Not necessarily the most impressive one but the best shot for scaling.
Kong: 327 px or 102 m
Distance: 517 px or 161.27 m
161.27 m/s, nearly Subsonic+ but still Subsonic
Big lizard goes full crocodile[]
Godzilla running all fours and mauling Kong like an alligator was creepy af lmao.
Covered that distance in about 0.5 seconds.
One storey: 9 px or 3 m
Distance covered: 344 px or 114.67 m
114.67/0.5 = 229.34 m/s, Subsonic+