The album was recorded in Copenhagen with Flemming Rasmussen, who owned the studio, serving as engineer and co-producer. In a Songfacts interview with Rasmussen
, he talked about recording "Orion":
"That was starting at one thing and then working through, and getting it done. It was actually really fulfilling, because it started to sound better and better. It wasn't hard getting the performance - it was more deciding which kind of performance we wanted."
Regarding Cliff Burton's bass parts, he added: "He had more or less all of the ideas himself, and he perfected them in the studio."