1.- Tau Volantis is the source of the signal
2.- The physical appearance of the statues in the alien city
3.- The hallucination of Isaac reveals a group of aliens waiting for the convergence
4.- The patterns of the alien language and marker signals
5.- Awakened hallucinations with Carr have candles, markers and alien structures
6.- Earl Serrano was a intelligent scientist as Isaac "Engineer" and Nolan "Doctor", possibly had a marker blueprint in his head.
7.- Mahad prefer destroy everything before Serrano made something with the machine
8.- The black marker in the earth was a meteorite
9.- The alien race create thousands of markers
10.- and at the end... the machine was in "pause", incomplete! waiting for someone?