Submersible platforms or jack-up rigs (with extendable columns) rest on the seabed while drilling is in progress.
Amaqonga anokuntywilisa okanye isixhobo sokunyusa into enzima nokuxhobisa isikhephe (nentsika eyongeziweyo) iphumle kumandlalo wolwandle xa uqhelaniso luqhubeka.