The first White Walker battle of season six was as epic as it was tragic.
It mostly took place in the narrow Cave of The Three-Eyed Raven, and was a challenging shoot involving CGI, practical effects, and a lot of explosions.
In a behind-the-scenes look by HBO, a few clever tricks are revealed that really made the explosions convincing.
Watch the full behind-the-scenes here.
Written by Ian Phillips and produced by Alana Yzola