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SpaceX launches starship Mega-Rocket and catches its booster in midair on first try.
(www.smithsonianmag.com)
This is a most excellent place for technology news and articles.
It shouldn't rupture a tank just because of a splashdown, no. Even if they're able to chopstick catch the upper stage, or land it like Falcon 9's boosters, a splashdown may be needed in emergencies.