Izi jekete moyo agalu wapangidwa kuti pazipita bouyancy ndi thovu mbali mapanelo.Chibwano cha thovu chimathandizira kuti mutu ukhale pamwamba pa madzi.Zogwirizira zapawiri zapamwamba zimapereka njira yosavuta yobweza galu wanu, pomwe chothandizira choyandama chakutsogolo ndi zingwe zosinthika zimawateteza kulowa ndi kutuluka m'madzi.