Very easy tame buy in a dangerous place when found in a swamp. First make sure the area is clean of mobs like snakes etc etc. Next start tranqing and kite it. They are really slow and turn slow , so it's easy to kite them in a circle. Once it's down , gather or use wooden spike walls around the sarco to ensure that it doesn't get Aten while knocked out , I usually always starve tame to make sure I don't lose any kibble or meat like mutton. I actually love my sarco , I use him for underwater drops until I get a mosas. Jack of all trades , fast in water with unlimited stam, tanky especially with a good saddle and can go inside underwater caves. You can also use a GPS or weapons which as a cross bow on the sarco too, making your first big underwater tame much easier and you don't need a water Dino pin for these guys.For getting pearls and deep sea loot crates level nothing but health. They get ALOT of health per level and can get 8k pretty easy.