Offshore oil drilling in shallow waters (depths of less than 500 feet) has been in existence since World War II. While oil spills in shallow water have occurred in the past, only 15 barrels of oil have been spilled in over 11,000 shallow water wells drilled in the past 15 years—a remarkable record. Compared to deepwater oil drilling, shallow water drilling is less complex, resulting in better safety records from a more established industry.