ʻO nā kihi hemispherical o nā pahu i hana muaʻia e ka undering cheel distel i loko o kahi kiko'ī i loko o kahi paʻi 500-ton. ʻO kahi limahana hoʻokūkū e hana nei i kēia ma ka hanaʻana i nā pale, e holo ana i ka nūhou, a me ka hōʻoiaʻana ua paʻi pololei kēlā me kēia'āpana.