These are movement under the ice using submarines, movement over the ice for example with air-cushion vehicles, and movement through the ice which then needs to be broken up.
Ezi ziintshukumo zangaphantsi komkhenkce, kusetyenziswa iinkwili, intshukumo ngaphezu komkhenkce, umzekelo ngezithuthi zokhuselo-moya kunye nentshukumo kumkhenkce lo kufuneka wophuliwe.