Making glass that can survive the Mariana Trench

Help

Four teams are diving to the deepest part of the ocean, the Mariana Trench, which lies 11km down in the west Pacific.

One of them is Triton submarines, a Florida-based company.

The centrepiece of their submarine will be a 15cm-thick glass sphere, which is being manufactured by Rayotek Scientific in San Diego.

Bill Raggio, the company's Chief Technology Officer, describes the difficulties of making glass that can cope with the enormous pressures that are found at the bottom of the ocean.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.