This session showcases major advancements in executing complex offshore megaprojects, spanning pioneering gas-injection facilities to the installation and commissioning of large-scale infrastructure under demanding conditions. The papers cover developments across the Americas, the Middle East, and Asia, ranging from gas to heavy-oil projects with challenging fabrication, installation, and operational environments. They highlight innovative engineering solutions, accelerated execution strategies, and risk-based decision frameworks that enable safe and timely delivery despite weather constraints, supply-chain disruptions, and high-pressure operating conditions, demonstrating how integrated planning and advanced analytical methods are reshaping offshore project performance and reliability.