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in the united states and around the world. i'm alex marquardt in washington. >> and i'm anderson cooper on the canadian coast. a new mission to investigate the debris of the imploded submersible. the company under intense scrutiny, as we're learning about early warnings that the sub might be unsafe. cnn's new reporting on the special counsel's january 6th investigation. sources revealing that at least two fake trump electors were given limited immunity in exchange for their grand jury testimony. and the chief of the wagner private military group makes a powerful claim, accusing l...

see the wreckage of the titanic. this hour the supply of oxygen is rapidly running out. we'll show you what conditions are like inside the small, cramped sub that left with five people on board. china is now lashing out at the united states after president joe biden referred to chinese leader xi jinping as a dictator. this as cnn is getting an exclusive look at military drills preparing for a potential chinese invasion of taiwan. welcome to our viewers in the united states and all around the world. you're in "the situation room." let's get right to the massive search for the miss...

In this D-Day special, Talking History explores the D-Day landings on the 80th anniversary of the...

At this time, scientists were already aware of the dangers of 'decompression sickness.'

During WWII, scientists breathed CO2, oxygen, and other gases to learn about diving and submarine travel. They helped make D-Day happen.