I LOVED this episode, but I dig all the Men of Letters stuff, so time travel and a submarine, and Nazi's, and kick ass Delphine, and a cool 'weapon' - hell yes! It felt refreshing to me to see a different set too, and I think the set/props department etc did such an amazing job with that submarine, and actually the whole cast was awesome too (Delphine was just so cool!)

I can't help but wonder if it's setting things up for the future, a mirror of what we're going to see; 'witness' and helpless Dean, sitting on the sidelines completely powerless and unable to help or save anyone...