Water Lungs and Mass Water Lungs spells:
Syntax: cast 'water lungs' <target>                     (Cleric Level 11 Spell)
                                                        (Mage Level 17 Spell)
Syntax: cast 'mass water lungs'                         (Cleric Level 27 Spell)
                                                        (Mage Level 31 Spell)

WATER LUNGS will let players who are underwater survive for a certain
amount of time without drowning by filling their lungs with a magic liquid.
Note that Merfolk do not need this spell to breath underwater.  (Min Mana = 10)

MASS WATER LUNGS lets the group survive underwater for a certain amount
of time.  More efficient than multiple castings of the single target spell
in groups of good size, though it only affects those with the caster.
(Min Mana = 25)

See Also: Drowning   (result of trying to breath water w/o 'water lungs')
          Swim       (warrior skill to facilitate movement through the water)