A breach is the result of a high speed approach to the surface with the resulting momentum taking the shark partially or completely clear of the water. This is a hunting technique employed by great white sharks whilst hunting seals. This behavior most often takes place on cape fur seals at Seal Island in False Bay, South Africa, and was first documented by photographer Chris Fallows. Here, in the region of 600 natural predatory events are recorded annually between April and September each year. The seals swim on the surface and the great white sharks launch their predatory attack from the deeper water below. They can reach speeds of up to 40 miles per hour and can at times launch themselves more than 10 feet in the air. Data recorded shows that the sharks are successful in just under 50% of all these natural predatory events.[46] In 2011, a 3-metre long shark jumped onto a 7-person research vessel off Seal Island. The crew were undertaking a population study using sardines as bait, and the incident was judged to be an accident.[47]