This is the Scuba Suit, a machine/vehicle suited for underwater operations.
It is based on the same platform as the Exo Suit, in other words, it has a very similar skeleton but a completely different type of bodywork.
This one is equiped with a high pressure resistant, closed body. There's room for one operator, who can oversee his actions through the porthole window.
The Scuba Suit's arms can hold several instruments, like harpoon cannon, heavy duty drill, etc.
For the main color I chose yellow as it is the most visible color underwater.
After all, this is by definition a type of submarine.