To mach what was seen in the trailer, the current build has been updated, it includes:

• slight UI changes for handling save files (previously it was difficult to read them) and other bug fixes in the menu system
• revamped voice over for the cutscenes, again stemming from the trailer to better match what the game is all about
• tool fixes (mentioned in this short devlog) as well as bug fixes for swapping tools
• larger refactoring for handling environmental effects
• now batteries can catch on fire or emit poisonous gas; it's a random chance on a countdown based on difficulty level
• marginal improvements to the voltmeter (as mentioned in that devlog), so now it can read the actual charge
• damage to the batteries can also affect the charge, and now the lights can go out if it reaches zero
• other bug fixes caught amidst all
• and other refactoring/optimization for the code

As usual, a lot goes behind the scenes, however, these are essential to make the interconnected systems work. As an example: How the navigation of the submarine is tied to having power and the engine run, which also effects if we can use any of the sub-systems, like lights or pumps. Which takes some faff to figure out.