Brusilov marker

"What was it, Carver? What did it show you?
"What do you mean?"
"The Marker. You saw something, didn't you?"
"I don't know what you're talking about. Let's just.... forget about this and find a way down to the planet. Alright?"
"Yeah, okay. Sure.
—Isaac and Carver upon exiting the CMS Brusilov

The Brusilov Marker was one of the countless ancient Red Markers made by the extinct alien race of Tau Volantis.

It was found on the planet and brought on board the CMS Brusilov to be tested and studied on. However, the testings are halted as Scenario Five was commenced. The Marker was left in the ship with all of the testing equipment left on it as the life support was disabled and the crew was executed for the next 200 years until Isaac and Carver decided to investigate something strange that happened to Carver.