History Explained on Instagram: "Follow @HISTORY__EXPLAINED for more interesting content! ✅ The clip shows a man jumping from 35-foot rocks at Llandudno Beach in Cape Town into what looks like calm ocean water. Moments later, a sudden surge of waves crashes over him. Filmed in 2023 and reposted recently. The video demonstrates wave shoaling a process in which waves grow taller and more powerful in shallow, rocky areas, sometimes increasing in height by up to 70%, according to University of Hawai