A significant improvement in deepwater well integrity and value can be accomplished by deepening the structural casing to have a dual functionality. This exploits the rapid growth of formation strength in the shallow first 1,000–2,000 ft below the seafloor. This first casing string in the deepwater well design would, first, support the axial and bending loads of the wellhead, blow out preventers, riser, and subsequent casing strings, as is the current practice, and secondly, provide sufficient casing shoe strengths the subsequent drilling while the mitigating shallow drilling hazards. The placement of the structural casing significantly deeper in the riserless sections than current practice allows for larger casing diameters in the deeper well sections. This significantly improves deepwater well integrity by widening the drilling operating window which decreases incidents the loss circulation and well kick cycles. This deepwater phenomenon is problematic and often prevents drilling to planned well depths. The method for deepening the structural conductor is the application of the Subsea Drive. This is large diameter liner drilling built to rotate the low-pressure wellhead housing and its conductor to depths well beyond current practice of jetting. The basis for this well design change has been the sporadic drilling performance in the execution of deepwater drilling operations, especially for exploration and appraisal wells, which has included some significant catastrophic well failures. Furthermore, the relentless demands of reducing capital costs of deepwater exploration and development is fundamental to the growth of the deepwater oilfield development.