The submarine barge is automatically kept at a depth of 150 to 300 metres, and so passes well below the ice cover.
Inkwili yesikhephe enesinqe esibanzi igcinwa ngokuzenzekelayo kubunzulu kwikhulu elinamashumi amahlanu ukuya kumakhulu amathathu eemitha, kwaye ziye zidlule kakuhle ngezantsi kwezigqumathelo somkhenkce.