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Starts 20:00 Sunday 29 October
Scroll into the depths to discover filming facts and secrets... |
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| HUMPBACK WHALE |
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| Humpback whales can catch up to 100kg of herring in one mouthful. |
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The limit for recreational scuba divers on air |
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| TUSKFISH |
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| The tuskfish uses coral as a tool to open shells. |
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| CLOWNFISH |
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| Male clownfish can change gender when the female dies. |
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| REEF MANTA RAY |
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| A reef manta ray spans up to five metres. |
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Maximum depth sunlight penetrates |
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| SPERM WHALES |
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| Sperm whales sleep suspended in the sea. |
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Maximum depth explored for Blue Planet II using a remotely operated vehicle |
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| SHARKS |
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| Some species of shark have been around for longer than trees. |
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| FANG TOOTH FISH |
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| The fang tooth fish has the largest teeth of any fish in the ocean. |
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| TOAD FISH |
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| A deep sea toadfish has fin-like feet to walk along the seabed.
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| SPIDER CRAB |
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| The spider crab uses pieces of coral as body armour. |
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Challenger Deep – the deepest place on Earth |
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| The incredible journey from the poles to the tropics starts at 20:00 Sunday 29 October on BBC One. |
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