Lazarus Chowder allows you to stay underwater for approx 220 seconds. Having swamp fever allows you to stay underwater for 106 seconds. Combine them together and you can stay underwater for about 440 seconds or just over seven minutes, with no levels into oxygen stat.
I recommend making large crop plots, tame a dung beetle, and use a berry-gathering Dino. When you grow the vegetables, find a bee hive, let the bees kill you and loot your body (bees won’t agro if you grab honey from your body), and now you have a guide on how to make Lazarus chowder.
this is the best for going underwater to get oil or taming a dunk, eat this before going into the water and have a scuba tank when ur oxygen goes down out the scuba tank on and than take it off to still use the chowder and you will keep ur scuba tank from breaking faster and save polymer, metal, gasoline etc