The Argos facility and Mad Dog 2 subsea project achieved first oil in Q1 2023. This presentation highlights a specific subsea system integrity challenge the team discovered and resolved during the progression to first oil and facility ramp up. The presentation includes project background, problem statement, repair overview, key achievements, as well as challenges faced and overcome during this critical phase of the project. Once considered an impossible operation, the presentation will share insight to the relentless planning, onshore trials, and focused execution which made the Mad Dog 2 In-Situ Repair a success.