Two men in workers' gear and colorful hard hats standing on board what appears to be a large ship, next to some very large machinery.
two men are sitting by the pool next to machinery on the boat
A person can't be sitting and standing at the same time.
The two men are standing on a large ship, not sitting on a boat. So, they cannot be doing the same thing at the same time.
The two men cannot be standing on board a large ship if they are sitting by the pool