A term applied to the space between the inner and outer skins of a vessel called respectively the "inner bottom" and "shell", usually extending from bilge to bilge and for nearly the whole length of the vessel fore and aft, and subdivided into water or oil tight compartments. In some cases, and generally in warships, the inner bottom is carried above the bilges to a deck at or near the waterline. Where more than one inner skin is fitted, as is sometimes the case, the two spaces are known as the "lower bottom tank" or "void" and the "upper bottom tank". The outer skin is known as the "shell", the skin next to it as the "lower inner bottom", and the third skin as the "upper inner bottom".
Igama elisetyenziselwa isithuba esiphakathi kwezikhumba zenqanawe ezingaphakathi nezingaphandle, ekuthiwa yi-'inner bottom' ne'shell', Sidla ngokunabela ukusuka kumphantsi wenqanawe ukuya komnye, naphantse kwabo bonke ubude benqanawe umphambili nomva wenqanawe, sahlulahlulwe ngokweekhompatimenti esingangeni manzi na-oyile.