Question from Kathryn Dransfield: Was the series mainly filmed in the ocean around the gulf of Mexico?
The Blue Planet Team: No, it was filmed all around the world in over 200 locations.
Question from James: How deep were the deepest pictures shown on tonight's programme?
The Blue Planet Team: The deepest images came from the hot vents around 4,000 metres down.
Question from Edward Mills: How much does it cost to use the submersable?
The Blue Planet Team: Over 20,000 dollars a day - however, working closely with scientists for whom we provided the cameras, we never paid that price.
Question from Roland Millward: What's the most dangerous part of the dive?
The Blue Planet Team: Nearing the sea bed when there's a risk of getting snagged.
Question from Howard Latimer: Was it harder to film in any particular ocean? Why was that?
The Blue Planet Team: Not really. The deep sea is a pretty uniform habitat all around the world.
Question from Ken: If dead whales fall to the ocean floor why does the pressure not cause them to implode?
The Blue Planet Team: They would definitely get compressed, however, most of their bodies consist of water which doesn't get crushed.
Question from Nathan Wren: At the beginning of tonight's program there was a fish with supposedly the biggest teeth in the ocean. How large would the actual fish be?
The Blue Planet Team: The fish itself is only 15 cms long.
Question from Tony Beach: Are there any strong currents in the very deep sea?
The Blue Planet Team: Not really. The currents are all quite sluggish at that depth because there is no wind down there.
Question from Ev Tait: What were the biggest frustrations in the making of the programme?
The Blue Planet Team: In the deep ocean, the biggest challenge was trying to get beautiful images using a submersible. There were about 15 cameramen and 12 in the production team.
Question from Laura: What causes the fish to flash with lights?
The Blue Planet Team: Bioluminescence - ie light that they produce themselves.
Question from Mike Harris: Did all of your equipment work O.K ?
The Blue Planet Team: No. Most of it didn't most of the time.
Question from Chris Wall: Am I right in assuming that all life that far deep in the ocean are blind?
The Blue Planet Team: Not really - many animals have surprisingly large eyes which are probably used for looking at bioluminescence.
Question from Dan Newman: How can sharks survive in an environment with such little food?
The Blue Planet Team: The sleeper shark is a very slow moving animal which is probably an adaptation to limited food supplies.
Question from Kevin Morrison: My mum says I have to go to bed - Could anyone help me with the maximum depth of the gulf of Mexico please?
The Blue Planet Team: Sleep well. But sorry, we don't know the answer to your question. We went to at least a 1,000 meters so it must be more than that.
Question from Atul Thakor: Does it get warmer as u get deeper after a certain depth as the waters heated by the earth's core?
The Blue Planet Team: It's very hot just by the hot vents, hundreds of degrees centigrade, but within just a few metres, the temperature drops rapidly to less than 5 degrees.
Question from ev tait: How does the submersible survive the pressure?
The Blue Planet Team: It is highly reinforced, and most importantly, it's very small. Larger military submarines cannot dive very deep.
Question from Amy Roberts: Do you breathe normal air in the submersible or is it a mixture, like in diver's tanks?
The Blue Planet Team: It's normal air. It is kept fresh by "scrubbers" that remove carbon dioxide as you breathe it.
Question from Nathan Wren: Like on a plane, do your ears pop when you dive in the submersable?
The Blue Planet Team: No, because there is no change in pressure inside the submersible.
Question from Al Shaw: What would happen in an emergency in the sub? how quickly can you get to the surface? Could something come and get you?
The Blue Planet Team: The submersibles are specially designed so that the chamber containing the observers can be released to float back to the surface.
Question from Shadow Fish: Is it cold in the submersable?
The Blue Planet Team: Yes, it does get cold.
Question from Ivan Bruce: How long did it take to descend to the deepest part of the ocean that you went to?
The Blue Planet Team: A couple of hours at least.
Question from Laura: Was there any emergencies while filming?
The Blue Planet Team: No
Question from Nicky Diamond: Are there any physical side effects of going this deep?
The Blue Planet Team: No, other than cramp from being squashed into such a small space.
Question from Jacqui: Did you know that the things that have never been seen before....had never been seen before, or was that a later find?
The Blue Planet Team: We relied entirely on the expertise of scientists we worked with.
Question from al shaw: How do you go to the loo when ur in the sub?
The Blue Planet Team: There's no on board toilet. Men use a bottle, women have to hold on or use a special pot.
Question from Nathan Wren: Did you discover any new species other than the hairy angler?
The Blue Planet Team: Yes the dumbo octopus we think.
Question from Annie M: Do you ever get claustrophobic in the sub?
The Blue Planet Team: Some people do but we didn't.
Question from p b: Did David Attenborough go on the underwater expeditions personally?
The Blue Planet Team: No. David's principle role on the series has been the narration.
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