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 missing submersible. the source of banging sounds in the area remains a mystery at this hour but they are giving rescue crews hope. when you are in the middle of a search and rescue you always have hope. that s why we re doing what we do. reporter: with what could be less than 24 hours of oxygen left onboard titan, hope at this point may rest on banging noises detected by sonar. the coast guard re
waters without permission. the military units are widely dispersed for forced protection to make they will more difficult targets for any invading force. there is a saying here, one commander told me. if you want to take taiwan, you have to take penghu first. and these forces are training to make sure that never happens. one message i heard consistently is they are preparing to defend themselves if necessary but they don t want to provoke china. they want things to stay the way they are. they take defense seriously. there is a brigade size force to respond to any potential attack. a sort of quick reaction. they take that threat seriously. what a great look inside taiwan s military preparedness. thank you so much. on the defensive, supreme court justice samuel alito blasting a new report that said he didn t disclose a luxury fishing trip with paul singer
taiwan buys billions of dollars in weapons from the u.s. but its defense plan depends in large part on developing and manufacturing many of its own weapons. its indigenous fighter jets and many of its navy frigates and apcs and tanks are taiwan built. this is our territory water. we won t allow other countries to sail through that water without permission. reporter: on penghu taiwanese military units are widely dispersed for force protection to make them more difficult targets for any invading force. there is a saying here one commander told me. if you want to take taiwan you have to take penghu first. and these forces are training to make sure that never happens. jim sciutto, cnn, the penghu islands, taiwan. thanks to jim sciutto for that report. coming up the ethics of justice samuel alito under scrutiny after a new report