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This article contains information from the Warcraft RPG which is considered non-canon.

The collar of this heavy helmet seals tightly around the wearer's neck, after which all air he breathes comes through rubber hoses from four bladders hanging on a shoulder strap. This has allowed underwater explorations to continue for up to an hour. Seahelms sold with a hand-cranked pump to refill their air bladders, a laborious process that takes more than an hour per bladder.[1]