I am loving this cover!!
Viewing post in The Scorched Citadel comments
Thanks it was an over draw of Tim Hildebrandt’s cover for “Earths Last Citadel” https://www.blackgate.com/wp-content/uploads/2015/05/Earths-Last-Citadel-Ace-1977-cover.jpg with some artistic licence to try and make the tube look like the river in the setting.