The material below is Open Game Content from a 3PP Source
Aquatic Enhancement ('Driftwood')
A weapon with the aquatic enhancement grants its wielder a swim movement rate of 20 feet. The wielder can move through water at its swim speed without making Swim checks, and gains a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. The wielder can always choose to take 10 on a Swim check, even if distracted or endangered, and can use the run action while swimming, provided they swim in a straight line.
The aquatic enhancement does not grant any ability to breathe underwater.
Any wooden or mostly wooden melee weapon (such as a club, a bow, or a spear) can be given the aquatic enhancement. Weapons not normally made of wood or only partially of wood (such as a battleaxe or a mace) cannot receive this enhancement. This has led some to disparagingly dub it the 'driftwood' enhancement.
Aura: Moderate transmutation; Caster Level: 7th; Prerequisites: Craft Magic Arms and Armor, creator must have 8 ranks in Swim; Market Price: +7,000 gp