Transocean attorney denies it had employees sign releases . CNN 's Jessica Ravitz contributed to this report . survivors of the Deepwater Horizon explosion testified to a congressional committee on Thursday . Also testifying was a brother of one of the 11 workers killed in the April 20 blast . Survivors say the company improved safety with employment cutbacks .
Transocean attorney denies it had employees sign releases . survivors of the Deepwater Horizon explosion testified to a congressional committee on Thursday . Also testifying was a brother of one of the 11 workers killed in the April 20 blast . Survivors say the company improved safety with employment cutbacks .