Marks made by their portable city transporters.
Que?
DMaxer wrote:Que?
https://thegreynomads.activeboard.com/t68364925/ailien-travel-and-civilisation-evidence-on-seafloor/
"No friend ever served me, and no enemy ever wronged me, whom I have not repaid in full."
Lucius Cornelius Sulla - died 78 BC