Description
The video is from VCB-Studio. They applied debanding and slight AA, plus adaptive denoising and texture sharpening. Both the remastered 5.1 and original 2.0 audio are from AK-Submarines, but I resampled them from 24bit to 16bit with soxr using low shibata dithering. This cut the audio file size in half, saving around 600MB. The main subs are the improved /ak/ Submarines subs from 2019. The chapters are from AK-Submarines.

Info
Video: 1920x1080p x265 10-bit
Audio 1: FLAC 5.1 Remaster
Audio 2: FLAC 2.0 Original
Sub: /ak/ Submarines (improved, great signs)
Chapters: yes

Tech Note
For those questioning the audio: increasing or decreasing the bit depth does not effect fidelity, it only effects the dynamic range by raising or lowering the noise floor. At 16 bit with no dithering it produces a 96db range and a noise floor that is already lower than what is audible. With shaped dithering, like what I applied, it increases the range in the audible frequencies to around 120db. For reference, that’s the loudness of a chainsaw. I highly doubt anyone is going to be listening that loud. 24bit non-dithered audio has a range of 144db, loud enough to immediately cause permanent hearing loss. That’s putting aside the fact that the highest end hardware can only output at around a 120db (20bit) range due to the limitations of integrated circuit designs.
TL;DR 24bit audio is pure bloat.