son, will get more than a view of the waves. >> when i first saw the couple walk out on the rocks i initially tried to warn them as did several other people on the shoreline. >> our first instinct was to yell at them and warn them because the waves were obviously crashing over the rocks but they, of course, couldn't hear us. >> the tourists are unaware that the waves in this area can be extremely unpredictable. waves are generated miles away and travel over the open ocean to hawaiian shores. they are large, powerful, and spread far apart. for people on the beach the water is calm one minute, but it can be a very different story the next. >> people come here. they watch the waves. they'll see a few smaller waves thinking that it's okay to get into the cove or the tide pools and they don't understand that every few waves or so two or three very large waves, larger than normal that they're watching, will come in and then they're in trouble. and this is a very rocky area. >> it's referred to as the cheese grater by the lifeguards