User blog comment:Eobard95/Problems with Prometheus/@comment-27673963-20170615083043

I think Adrian knew about E-2 Laurel and the Waverider because he stalked Oliver during the crossover episodes. The only reason I think this is a plausable theory is because Talia knew all about Oliver's life when she found him in Russia, she has superb Tracking skills which she would have passed on to Adrian