Extreme Buoyancy

Evocation
Level: Alchemist* 2, Bard * 2, Druid * 2, Hunter * 2, Ranger * 2, Shaman * 2
Components: V, S, M (a bag of air), DF
Casting Time: 1 Standard Action
Range: touch
Target: creature touched
Duration: 10 minutes/level
Saving Throw: Will negates
Spell Resistance: yes
  The target's buoyancy becomes and stays swiftly rising, regardless of how dense the target and its gear are. Among other effects, the target needs to succeed at a DC 20 Swim check to submerge itself and to stay submerged (see Buoyancy on page 43).