. >>> i'm darren jordon in doha, ahead, debris found in the hunt for missing malaysia airlines flibility mh370 sent to france for testing. british workers move in to and crumbling away >>> "america tonight" sheila macvicar in the south pacific with a die off and the threat it poses to all of us. >>> thanks for joining us, i'm joie chen. tonight a look at the oceans and the threats beneath the service. coral reefs are like a rainforest beneath the ocean. it sustains the fish and people too. alarming data shows unless carbon dioxide can be brought under control, what is known as coral bleaching, a die off of the critical underwater creatures could set you have a chain of environmental disaster. "america tonight"'s sheila macvicar travelled to the south pacific's marshall island for a first hand look. short. >> yes. >> reporter: on the boat. this is a dive master. located in the vast pacific ocean between australia and hawaii, imaginero is a populous of dozens of atolls making up the marshall ined. the way to make his living, taking tourists scuba diving among some spectacular coral reefs i

. >>> i'm darren jordon in doha ahead, debris found in the hunt for missing malaysia airlines flibility mh370 sent to france for testing. british workers move in to strengthen security at the tunnel as the migrant crisis worsens >>> it was a family hare loom passed down for 50 years, now one of the oldest baseball cards in existence is sold at auction >>> the future of peace talks in afghanistan has been thrown into doubt by a change in leadership. they have confirmed the death of spiritual leader mullah omar. talks between the taliban and the afghan government on friday will not go ahead. jennifer glass on the death of mullah omar. >> reporter: it's unclear what changes we'll see under the new taliban leader. the taliban sources telling al jazeera that mansour has been involved in making political decisions over the last few years. there are obviously two different areas of the taliban. you have the political side and the military side. the fighting has been serious in this spring fighting season and over the last couple of weeks, in the last couple of days taliban has taken dozens of

. >>> i'm darren jordon in doha, ahead, debris found in the hunt for missing malaysia airlines flibility mh370 sent to france for testing. british workers move in to

. >>> i'm darren jordon in doha ahead, debris found in the hunt for missing malaysia airlines flibility70 sent to france for testing. british workers move in to strengthen security at the tunnel as the migrant crisis worsens >>> it was a family hare loom passed down for 50 years, now one of the oldest baseball cards in existence