With this mod, you can explore the underwater wastelands of the game for much longer! There are two types of scuba gear, with one air cylinder and two cylinders. Also, the player swims a little faster underwater. The visual style of displaying the remaining oxygen is made in the style of the original strips of the game. You can find them all over the state of the game. If you want to take off your scuba gear, you can just step away from the water or enter the cheat code "DIVING". The position of the strip on the screen, the amount of oxygen in the cylinders and the speed of scuba diving can be configured in the .ini file.

Thanks to Vladvo for the test and advice.