Dual-derrick ice-worthy jack-up drilling unit

A drilling jack-up rig comprising:

• i) a flotation hull having a generally flat upper deck;
• ii) an ice-bending portion of said flotation hull extending downwardly from at or near a periphery of said deck and tapering inwardly, wherein said ice bending portion has a shape and a strength sufficient to provide ice bending and breaking capabilities against an ice floe;
• iii) an optional ice deflecting edge extending generally vertically down from a bottom periphery of said ice-bending portion to direct ice around and not under said flotation hull;
• iv) at least three legs that are positioned within a perimeter of said flotation hull;
• v) a jack-up device associated with each leg to raise and lower each leg;
• and
• vi) at least two derricks mounted on said deck;
• wherein said at least two derricks are positioned on the same horizontal side on said deck relative to a first centerline of the deck, and opposite horizontal sides of the deck relative to a second centerline of the deck perpendicular to the first centerline or at the opposite horizontal sides of said deck equidistant from a center of the deck.