five people on their way to explore the titanic. new questions about the sub s safety, the warning signs. the ceo among the victims describing the sub s plexiglass windows 7 inches thick squeezing in under pressure. oceanographer robert ballard who discovered the wreckage of the titanic describing what he calls a smoking gun. tonight we re learning more about the push to book passengers. a businessman revealing text messages offering seats for him and his son at a discount price. and word late today the ntsb will now join the investigation. gio benitez on what authorities have now revealed. and those major developments in the war in ukraine. the leader of russia s mercenary group calling for an armed mutiny, claiming his fighters were attacked by the regular russian army. ian pannell in ukraine. here at home, the severe weather threat at this hour from texas to montana. a tornado watch in effect across several states, heavy rain moving into the northeast this weekend, a