Where we encounter marine megafauna, we see only a tiny slice of their habitats and lives, which rarely includes feeding. These animals may travel thousands of feet vertically or migrate a few thousand miles horizontally to meet their nutritional needs. Some of them — sperm whales, for example — must do both: descend to depths of up to a mile or more to feast on aggregations of squid and roam across large swaths of the Pacific to avoid depleting their food resources in any one area.
No matter which alternate air source you choose, learn to calculate your air consumption and regularly practice emergency procedures. There are many ways to configure each type of redundant breathing-gas supply, but make sure your setup matches your training, gear arrangement and dive objectives. If a naysayer thinks your equipment choice is unnecessary, let them know that the difference between a fatal accident and an embarrassing incident could come down to a breath or two. Any redundancy is better than none.
The seven days in the Galápagos went by too quickly, and I was ready to come back before I had even left. The Galápagos National Park and the tour operators greatly respect the destination, and conservation is their primary goal. Even with all the protections in place, the fishing industry, climate change and ocean health pressure the archipelago. Every tourist dollar that goes into the Galápagos adds persuasive emphasis that this is a place that deserves ongoing and stringent protection.
Humpback whales feed in polar waters during the summer and then migrate to tropical or subtropical waters to breed during winter. Various locations offer seasonal whale-watching, but swimming with them is legal in only a few places — Tonga is one of them. Every year its warm and sheltered waters provide a nursery for the whales, which gather there between July and October after a long migration from Antarctica.
Dans le cas des événements indésirables, il y a presque toujours une cascade en quatre phases : l'élément déclencheur, l'agent invalidant, la blessure invalidante et la cause du décès. Individuellement, chaque événement peut être évité. Le fait d'en reconnaître un au moment où il se produit permet de réagir et d'essayer d'atténuer le risque avant qu'il ne devienne un problème. Dans l'analyse des causes profondes des événements indésirables, les facteurs les plus importants sont la non-reconnaissance de l'événement et l'absence de réaction.
