Here are a couple easy crouch clips that save a lot of time in the Safe Haven run:

G5:
https://www.youtube.com/watch?v=ff9eBZcmZIc

B8:
https://www.youtube.com/watch?v=aiDW7cmlOIA

Safe Haven Crouch Clips

Infomastr

Metzix

Vitja

sevay

Alien: Isolation

IL - M5

_xEB

lilfred09

Maryx

SWAYZE_

Lingard

Amanda

Dallas

Ellen

Parker

Ransome

Axel

Hughes

Ricardo

CC Only

No CC

Nightmare

Novice

CC+FPS

Character

Glitch Tech

Difficulty

Console Platform

Exit

Objective

PlayStation 3

Xbox 360

PlayStation 4

Xbox One

Android

Macintosh

Linux

Switch

PlayStation 5

Xbox Series X

Alien

Rule Clarification: "Fast Mission 1" Glitch and Related Speed Glitches

Crouch Clipping

Setting up LiveSplit to use the Load Remover

Survivor Mode Mapped

What category to run?

Speedrun mod possibilities

dcruze

wildfire011

NinthElement

Lincolnbruh

twitchy_Vx