http://xpdzhyr65rgkqcljhrgy5jqprzc7qvksdj34w2excdy6ysaaqhk3vnqd.onion/kerbol.php
The name Kerbol is mixture of Kerbin and the word Boolean, because it is not only flat, it is also tube shaped. Which can't be seen by ordinary means because of the small size of the hole and the brightness of the star.