These men are completing repairs to the sewage tank on a large ship. Although the tank is "sanitized", it still takes a few days to get the smell out of your nose (and off your body). This is only one quarter of the tank, which holds 400,000 gallons. When these men tell their families that they had crappy day, they mean it.
I'm glad you got the look from the man in the center! Good angle even if it is the only one reasonably available to you. Too bad on the bright nearby pipes, maybe a little digital burning to darken?