The History Channel has 2 of these past episodes free online.  Check back as they will probably post the current season’s shows after they air.  The site shows the current season's shows.  
 
www.history.com/shows/ancient-aliens/videos/playlists/season-2-full-episodes#ancient-aliens-underwater-world
 
In this show they make occassional overstatements that are drawing some firmer conclusions than I might, but this is really decent information for a TV show.  Some places where they state it is proof I might say it was likely.  Fairly minor point though.  
 
It is presented w/ a minimum of drama for TV.