CNN  —  As a professional big wave surfer, charging down mountains of water that reach the size of an apartment block, Garrett McNamara doesn’t scare easily. Perhaps best known for taking on huge walls of water in his television docuseries, “100 Foot Wave,” the 57-year-old Hawaiian earned himself a world record in 2011 – which has since been bested – for surfing the biggest wave in the world, a 78-foot (23.8 meters) monster in Nazaré, Portugal . But despite his fearlessness and aptitude for