Lightning God Thor (or rather, Ollerus disguised as Thor) stood directly on the ocean, listening to the rumbling.
Technically, he was standing on a large amount of goat fur he had scattered on the ocean surface. Needless to say, this was a spell constructed using the symbols of the goats that pulled Thor’s chariot.
A disguise could be a lot of work.

Toaru Majutsu no Index New Testament vol.8 ch.4 pt.10