When I was a good deal younger (30 yrs ago) I worked on a tuna boat as a poler. I've found this clip on Youtube to get an idea, if anyone's interested.
(if you could imagine the deck so full of tuna that as the boat rolled, tuna would wriggle over the side)
Our boat was always one of the top boats for tonnage poled on board, quite hard work, long hours and decks full of tuna etc. We'd get worked to a frazzle poling them on board, then have to jump onto the deck full of tuna - while dodging the hooks and tuna from the auto poling machines - to clear the deck of tuna to make room for more. It was nothing for some days to pole 30-40 ton of tuna and then clean the boat while travelling to catch bait for the following day, up all night baiting, then to fish all the following day. At sea for a month at a time, no daily showers, covered in tuna blood and slime, sunburnt. Rough and ready guys, no room for SNAGS.
So hopefully that puts some perspective of what it was like - I loved it!
The deck hands had a small shared fridge to put drinks in, and as I suffered from seasickness, I'd keep a litre of dry ginger ale in it to have a drink to ward off the effects of being sick. Well my drink constantly seemed to evaporate daily all by itself. So after some weeks of this I spoke to the other guys and told them that if they wanted a drink to simply ask, the answer would be yes - just ask. Well it continued, and I kept thinking, they're all young and should but don't know better. Until...while on watch one night I went below and peed into the dry ginger, about a cupful per litre of (my) drink. In the morning I got up, went into the galley for breakfast, with the guys sitting around waiting for me to spit the dummy as usual - it was a little game for us. I sat down and pretended to crack up about the evaporation and we all laughed about it, and I continued to act up (and pee into each bottle of my ginger ale) for the following months until the end of the season.
When we finished our end of the fishing year maintenance of the boat, the skipper invited us all up to his cabin for farewell drinks and during our joking around he found out about the evaporating ginger ale. He asked me if I wanted to keep my drinks in his fridge the following year, I started giggling like a school girl and couldn't stop - tears, the works. The guys seriously thought I'd really lost it, they tried to calm me down and eventually I did and then told them that between them they'd drank a good couple of gallons of my pee.
The skipper nearly wet himself laughing, the other guys...not so much.