With the recent discoveries, we now can gain at least 6 seconds in the Mine - and, by doing so, we can skip 1 shockwave cycle. Here's the video to prove it \o/

the skips and tricks used in the optimized segment are:

• side bounce from door hit + quick recovery
• beach landing the submersible
• 1 breath swim
• minimal swings on ropes
• facing the freaks #1
• top ladder early jump
• minimal crank turns
• facing the freaks #2
• mounting the jetbox
• stumble glitch
• instant recovery from door stun

I'm not fully convinced the stumble glitch is absolutely necessary. you can see the fully optimized run reaching the block a bit sooner, even pausing for ~1sec before the blast hits.

(check the video playlist for the full list of Inside skips : https://www.youtube.com/playlist?list=PLpJA1uAgx2cXg4fjHGK9yBQfKfdMWJmUz )

with this new setup for the stumble glitch, it's possible to get another shockwave skip (as you can see in the last 10min of this video)