Caribbean Diving Best

Younger brother is afraid to go diving?
We are planning to go diving this summer under the supervision of a certified instructor as an excursion a cruise. Unfortunately, my brother is worried that will run out of air (only going about 15-20 feet deep, so that the remote possibility that occurs, it is not too difficult to swim to the surface (again, there are plenty of people who will be there in case, is the clear waters of the Caribbean, so they can see it). All I can say to reassure that he will not drown?
Since it sounds, do not fully understand the danger of diving. Even at 15-20 feet, with the air breathing, going too fast could do some serious damage. Do not dismiss the dangers, since they are "superficial". Despite running out of air is slightly likely, worse things can happen. One of the most important things to have a diving insurance is trust. It's easy to Freak Out down there and that's when bad things happen. If the brother does not feel for diving, forcing him to do so is dangerous. There are considerable security measures into place. Knowing the specifics could relieve him. Never alone. There is always someone there to help. Each diver has a breather Re seconds so if you run out of air, grab your partner can spare and the surface safely. Before you dive, take a considerable amount of time going through security procedures and equipment. Each diver has a pressure gauge saying him / her the amount of air that he / she is gone. You may be able to get his brother to go through training without needing to dive. Once he sees how work, you may change your mind. But please do not pressure him something that is ultimately not want to do – especially with the danger that high.
Caribbean – Diving St. Vincent Grenadines Japanese Gardens