By simply pursing their lips and blowing, the caster creates a 2-foot spherical air bubble within 30' of themselves. For the spell's duration of 1 hour, the air in the bubble will magically replenish itself, for utilization as a magical scuba tank. Any submerged objects or creatures that fit within the 2' sphere will remain completely dry, with the bubble repelling the outside water. All other physical matter may pass in or out of the bubble freely. By concentrating and keeping the air bubble within his/her line of sight, the caster may move the air bubble and its contents in any direction at half his/her physical movement rate.
Casting this spell using a 2nd-level spell slot or higher will increase the spell's duration by one hour per spell slot used above 1st level