This is a platform, usually sited against a tidal wall of a dockyard, on which a vessel is berthed at high water for underwater inspection at low water.
Eli liqonga, eliqheleke libasecaleni komjelo wedonga le yadi yedokhi, apho inqanawa ibekwa kumanzi aphezulu phantsi ukwenzela uhlolo lwamanzi angaphantsi kumanzi asezantsi.