A Transocean employee who served as chief mate on the Deepwater Horizon testified Monday that he believes the rig crew's emergency training saved lives following the 2010 explosion that killed 11 workers and triggered the nation's worst offshore oil spill. David Young, who was second-in-command to the rig's captain, said he believes 115 workers managed to escape the burning rig that BP had leased from Transocean because they followed their training.