| [00:00.33] | Tropical islands are an obvious magnet for life. |
| [00:04.08] | But things are just as busy underwater. |
| [00:07.70] | Deep currents collide with these islands, |
| [00:10.49] | forcing small but vital amounts of nutrients up from the depths. |
| [00:14.61] | At 50 metres deep, sea fans are amongst the first to benefit. |
| [00:19.63] | Closer to the surface, corals have sunlight to help them grow. |
| [00:24.72] | And thanks to the smallest trickle of nutrients, |
| [00:28.00] | a barren desert can bloom into an underwater oasis, |
| [00:32.28] | supporting a greater variety of life than any other ocean habitat. |
| [00:37.76] | These coral reefs are a magnet for green turtles, |
| [00:42.66] | offering a service not available in the open ocean - |
| [00:46.11] | a good clean-up by a shoal of tangs. |
| [00:49.45] | This work-over is far from cosmetic. |
| [00:51.97] | As well as removing parasites, |
| [00:53.44] | the cleaning stops the build-up of algae, |
| [00:55.43] | so the turtle can swim freely. |
| [00:57.80] | But it's also got to feel good. |
| [01:00.95] |
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