Timothy Alberino's report on Phil Schneider and Deep Underground Military Bases (D.U.M.B.s) is one of the best videos on the subject.
Regarding Donald Marshall, he is the biggest whistleblower of all-time. He exposed human cloning and the underground alien threat (aka #Vrill). He has done many interviews that you can easily find on Youtube. I will share the first one I ever watched of him below:
.ps Please ignore anything positive that was said about rapper B.o.B. in this interview because he later ended up backstabbing Donald (quite literally too).