ʻO ka ipu kanu ʻuala i hana ʻia me ka lole ʻaʻahu ʻaʻole i ulana ʻia, e hōʻoia i ka ventila maikaʻi e pale ai i ke aʻa aʻa, hāʻawi pū i ka oxygen no kāu mau mea kanu.A hiki ke hoʻokuʻu koke ʻia ka wai nui e hōʻoia i ka ulu maikaʻi ʻana o kāu mau mea kanu.