I believe Tether will never touch $0, because if Tether has touched $0, then of course it is not safe to invest in Tether anymore, because Tether is a stable coin, so if the price of Tether reaches $0, then that means people don't trust to use Tether anymore as a stable coin and that will make Tether no longer safe to use, therefore as long as the price of Tether has not fallen below $0.8, then of course Tether is still very safe to use as a stable coin.