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Understeem is just a fork of Steemit. It uses the same blockchain.

It isn't called "UnderSteemit" because Steemit is trademarked.

well if its a fork then wouldn't it be it's own blockchain that we could mine understeem tokens? Bitcoin classic was a fork of bitcoin core and has a different blockchain and same with ether and etherclassic.

STEEM and Steemit are two different technologies.

Imagine Steemit and Understeem being more like the difference between Bitcoin Core and Electrum-BTC. Both are on the Bitcoin network, but they work differently.

In the same way, Steemit and UnderSteem both operate on the STEEM network.

Got it thanks!