tag:bbc.co.uk,2008:cps:playlist:mediaAsset:17046179 Submarine gives taste of Mariana Trench dive Science reporter Rebecca Morelle joins Triton Submarines in the Bahamas as they take a prototype, deep-diving submarine for a test dive. 2012-02-15T13:32:38Z en News 17046179 99110 true tag:bbc.co.uk,2008:cps:advert:mediaAsset:17046179 tag:bbc.co.uk,2008:cps:ident:news:video:640x360 tag:bbc.co.uk,2008:cps:mediaAsset:17046179 tag:bbc.co.uk,2008:cps:playlist:mediaAsset:17046182 Making the world's toughest glass Bill Raggio from Rayotek Scientific describes the difficulties of making glass that can cope with the enormous pressures found at the bottom of the ocean. tag:bbc.co.uk,2008:cps:playlist:mediaAsset:17060355 'At 30,000ft we heard a crack' Don Walsh recounts his experience of diving to the deepest part of the ocean, the Challenger Deep, 11km down. tag:bbc.co.uk,2008:cps:playlist:mediaAsset:17046188 Designing a submarine that 'flies' Engineer Graham Hawkes describes why he has designed a submarine that is based on a plane. tag:bbc.co.uk,2008:cps:playlist:mediaAsset:17046185 Solo mission to the deepest ocean Chris Welsh describes why he wants to make the world's first solo dive to the bottom of the Mariana Trench. tag:bbc.co.uk,2008:cps:playlist:mediaAsset:17047137 How to build a sub: Robotic arms Liz Taylor, from DOER Marine, explains why robotic arms are essential for their Deep Search submarine. tag:bbc.co.uk,2008:cps:playlist:mediaAsset:17047131 How to build a sub: The glass Liz Taylor, from DOER Marine, explains why glass is a crucial material in the Deep Search submersible. tag:bbc.co.uk,2008:cps:playlist:mediaAsset:17047134 How to build a sub: Flotation Liz Taylor, from DOER Marine, explains why ceramics are the key to making a submarine that can sink or float. tag:bbc.co.uk,2008:cps:playlist:mediaAsset:17047305 How to build a sub: Design Liz Taylor, who runs DOER Marine, explains the factors that have driven the design of the Deep Search submersible. tag:bbc.co.uk,2008:cps:playlist:mediaAsset:17047138 How to build a sub: Pressure hull Liz Taylor from DOER Marine explains why they are using a life-size model of their pressure hull for their submarine.