Salty people can lick a Stupendemys's crystal shell for good luck. It might solve their immersion issues.

“This rare tortoise’s ability of flight is granted by its fabulous shell made up of solid wind crystal. As long as the shell remains undamaged, the cloudkin will remain aloft; however, the moment even the smallest of scratches are suffered, it will plummet back to Hydaelyn.” -Stupendemys