Darkstar_crow
Maybe make a meeting between the Foundation and the magician of the Marvel world? Like the called employees (from the gacha) met the magicians and thought that they had met thaumaturges (thaumaturgy magicians) from the SECOND HAPTIC ASSEMBLY organization. In principle, they are easy to add since the FBI sources investigated their organization as fanatical cannibals
Author you do remember that the main character can travel through water right, not just act as if he's on land while under water? Why would he need a submarine unless it's only for those who he wants to meet with, but he can still use the ability to travel through water to appear in the place he needs to get to.