We are running an underwater campaign where everyone is an aquatic race, and most of the campaign will take place completely underwater. Call Lightning says:
"A storm cloud appears in the shape of a cylinder that is 10 feet tall with a 60-foot radius, centered on a point you can see within range directly above you. The spell fails if you can't see a point in the air where the storm cloud could appear (for example, if you are in a room that can't accommodate the cloud)."
Does this literally mean you must be able to see a point "in the air", or could this work beneath the waves?