Thank you so much for the detailed response, but also your comments on other modules. I am finally getting to my ratings and after reading a module and formulating an opinion, I will read the other comments and find yours very insightful and covering most of what I wanted to say and better than I could phrase it. For example, I found your comment about the dial from 9 to 7 very helpful. I am preparing to rebuild the document with some design changes and some visual edits to address the contrast issues, and as I looked back on my work there was something I didn't quite like about the execution of it, but you summed it up perfectly. While I love the free icons I used from gameicons.net, I would like to ideally replace them with custom ones, and scrap some others in favor of a small illustration or technical diagram for things like the boat or the sub.
I also appreciate the notes on the bends - I knew it wasn't enough of a threat but I couldn't figure out how to implement it the way I wanted. The intention was to have it interact with the depth layers and time mechanics, i.e. until you repair the decompression chamber you would have to come up slowly (meaning you are stuck underwater with the threats looming or risk the bends), and even after you repair it you have to take some time in the chamber (more forced downtime in an enclosed space adding to the time pressure, perfect scenario for someone to fail a save and wig out). Your notes gave me a lot of ideas on how to beef up that mechanic and make it more central to the design and pacing of the scenario.