how is the former tourism activity done?
It is a mode of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba), which is completely independent of surface supply, to breathe underwater.
Scuba diving
 a mode of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba), which is completely independent of surface supply, to breathe underwater. 
where did hurricane edna hit? The United States East Coast when? September 7, 1954. how fast was it? UNANSWERABLE where did it originate from? Caribbean Sea can you name any plant that can be seen around the region? Guaiac wood ("Guaiacum officinale"), the flower of which is the national flower of Jamaica and the Bayahibe rose ("Pereskia quisqueyana") , In coastal zones there are coconut palms and in lagoons and estuaries are found thick areas of black mangrove and red mangrove ("Rhizophora mangle"). what factors do support their economy? The sea is one of the largest oil production areas in the world, producing approximately 170 million per year. Tourism based upon scuba diving and snorkeling on coral reefs of many Caribbean islands makes a major contribution to their economies. how do human activities affect it? Human activity in the area also accounts for a significant amount of pollution.
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Scuba diving [SEP] Introduction
Scuba diving is a mode of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba), which is completely independent of surface supply, to breathe underwater. Scuba divers carry their own source of breathing gas, usually compressed air, allowing them greater independence and freedom of movement than surface-supplied divers, and longer underwater endurance than breath-hold divers. Although the use of compressed air is common, a mixture of air and oxygen called enriched air or nitrox has become popular due to its benefit of reduced nitrogen intake during long or repetitive dives. Open circuit scuba systems discharge the breathing gas into the environment as it is exhaled, and consist of one or more diving cylinders containing breathing gas at high pressure which is supplied to the diver through a regulator.