Oil remains the most significant energy source. According to forecasts, energy demand is expected to nearly double by 2030 compared to today's needs. The demand for oil is likely to continue to dominate. Together with natural gas, these two resources will cover half of the energy demand. Nowadays, offshore extraction of oil and gas is becoming increasingly important. While extraction was long concentrated in only a few regions, today maritime areas are being explored worldwide. As new extraction areas are developed in increasingly inhospitable locations, the requirements for drilling and production units, as well as for complementary vessels, are also rising. This book addresses the market situation in the oil and gas energy sector, as well as the specifications and market development of drilling and production units in the offshore sector. It particularly focuses on the market and fleet development of various specialized vessels. Additionally, it highlights currently and potentially significant offshore regions and projects.