Its either the easiest tame or the hardest, have a basi or megalodon tame ln follow that you can hop on to kill any wild megalodons, but once the fishes start cleaning the megachelon you will have to be swimming with a crossbow to kill the salmon and coel that spawn into to eat the little fishes. Takes like half an hour to tame, easier if you have tribemates.

Once found a Megachelon, search for a Microbe Swarm in it's premises. draw the swarm to the turtle and swim under it until taming starts. the level of the swarm seems to effect taming speed, effectiveness is always 100%. multiple swarms seem to be possible to shorten taming time even more. salmon bites reset taming completely! once taming starts leave it quickly by moving out of render. tribe log will inform you about finished tame.

They're pretty easy to take.

Get an underwater tame. I highly recommend the Basilosaurus, as the jellyfish + squid + eels can't knock you off or stun you.

Head to the underwater trenches and reefs near the far left side of the Fjordur map, turtles will be everywhere.

If possible, get a Tek Helmet and activate the sonar down there near the ocean floor. This will detect a school of fish for you.

When you find one, agro them and lead them to your Meacheron. They'll de-agro on you and begin following the turtle, and this will start your tame.

(Be sure to protect them from Megalodon, Ichty and Coecalanth)

Well I will say this don’t try and tame it’s near impossible and they have really bad damage but they have op health and you can build on them and they provide air underwater hope this info helped to tame them you need to lure a fish horde to them and keep it safe and carnivores will be attracted during this process and it takes like 36mins to tame :)

You must be DISMOUNTED when trying to initially get the microbe swarm to aggro the turtle. After that, you may re-mount. As long as a player (any tribe, possibly unintended) is in very close proximity to the turtle, it will tame at a static rate regardless of level. It takes ~30-45 mins to tame without reset.

I play official and have tamed a couple of these there simple but hard to tame first u want to trap it then u might need a second player to stay close to it so it won’t go out of the trap when u get out of tender distance then u find the swarm fish and u can use the HLNA drone to scan the fish to see what lvl the swarm is depending on the lvl the less swarm fish u need so if u find a 150 swarm u will be able to tame any lvl megachelon off that single swarm but u must sit there and watch it when I did it the first time I wasn’t looking and it kept resetting the taming bar even tho there were not enemies nearby so u have to keep watching it while it tamed or u can tame it with the glitch and all u have to do is do the same thing except soon as u Afro the swarm fish on the turtle use HLNA to teleport away and watch ur tribe log for when u tame it it will tame eventually while ur at ur base doing whatever hope this helps 👍🏿