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a good sunday evening to you. i'm jim sciutto, and this is cnn's special live coverage of the extraordinary yet short-lived uprising in russia that has left much of the world asking exactly how this happened and what could happen next. is putin's leadership under threat? is this an opportunity for ukraine to repel russia's ongoing invasion? we do have new developments tonight, including reaction from the biden administration. but first video has emerged on social media which shows the crash site of a russian military transport plane, reportedly shot down in southern russia saturday b...

this is where five explorers and would-be explorers first set off on friday, out into the open ocean, traveling some 460 miles from here toward the wreck of the rms titanic. then on sunday morning they were sealed inside the submersible tight sxn lowered into the ocean for their descent to the seabed some 13,000 feet below, about two miles. less than two hours later communication, as you know, was lost with the submersible and we just learned it was about that time a senior navy official tells cnn that a navy network of underwater sensors picked up sounds consistent, they said, with ...

a good sunday evening to you. i'm jim sciutto, and this is cnn's special live coverage of the extraordinary events this weekend out of russia. moscow's red square blocked off again today after the brief but stunning insurrection that's gripped the world, could perhaps weaken vladimir putin's grip on his country. we should note it's far too soon to know. so much we don't know about what led wagner mercenary group leader yevgeny prigozhin to launch a march on moscow and what convinced him to abruptly call it off. and then, it's said, go into exile. u.s. secretary of state tony blinken ...

Basic safety regulations. here's some of that interview. >> and in a multi-seat vehicle where i intended to be the pilot, we'd go through all of the rigorous test protocols and review protocols that you have with, let's say, abs, which is the american bureau of shipping, or dnv or german lloyds, who are the major bureaus that class a sub. they call it classing, but it's basically certification. and i think it was unconscionable that this group did not go through that rigorous process. there is a great, almost surreal irony here which is "titanic" sank because the captain took it full steam int...

A.b.s., which is the american bureau of shipping, or dnv or german lloyds, who are the major bureaus that class a sub. they call it classing. but it's basically certification. and i think it was unconscionable that this group did not go through that rigorous process. >> this was an experimental design, there's no question about it. it's a carbon composite. you can tell us more about what that actually means. it's the kind of stuff used in spacecraft. but is it designed for deep underwater pressure? and what is the danger of that kind of material in this kind of environment? >> it's completely ...