I checked the footage in Premiere Pro, and i actually got 5:56 because i hit it on 5:56.59 (the ms counter on the timer only goes to 60 because its based on the fps of the recording, which is 60) which is the frame it started fading out after i pressed the submarine. I also started the timer a couple frames too early.

Finally i got a sub 6. Incredible run. Im back on speedrunning this game :D

Alot of audio had to be cut out of the video because i was talking to someone and i was saying dumb stuff lol

Mod Edit: From the video time looks to be a 5:57, but Ziquids has provided raw footage of the run, which confirms it to be a 5:56 by a 1 frame margin, congratz! Mod Edit: Due to new rulings, 5 seconds will be added to the final time due to raising the Life Raft after having lowered it