Guardian environment reporter Oliver Milman joins a group of scientists on an underwater expedition off the Bermuda coast to help chart its hidden depths and gauge the general health of the area’s reef and coral. Subscribe to The Guardian on YouTube ► http://bit.ly/subscribegdn Travelling in a two-man submersible, Milman and submarine pilot Kelvin Magee go on a journey 500ft below the surface. Support the Guardian ► https://support.theguardian.com/contribute Today in Focus podcast ► https://www.theguardian.com/news/series/todayinfocus Sign up for the Guardian documentaries newsletter ► https://www.theguardian.com/info/2016/sep/02/sign-up-for-the-guardian-documentaries-update The Guardian ► https://www.theguardian.com/ The Guardian YouTube network: Guardian News ► null Guardian Football ► null Guardian Sport ► null Guardian Live ► null Guardian Culture ► null #DeepSeaDive #Bermuda #Coral #ClimateChange