Watch: Game of Thrones transforms Belfast's Wolf Hill Quarry for epic battle
Spoilers for episode six - Beyond the Wall.
The makers of Game of Thrones have been revealing how the epic battle in this week's episode was created - with Belfast's Wolf Hill Quarry at the centre of the action.
The sixth installment of the current series - titled Beyond the Wall - saw Jon Snow lead his band of men, including Jorah, Gendry and The Hound, beyond the wall in their bid to capture a wight from the White Walkers to prove to Cersei Lannister the threat is real.
The result was an epic battle that left fans in awe and the show's producers have been speaking about how the huge scenes were put together.
In a behind the scenes clip, it is revealed that while a lot of shots were filmed on location in Iceland, a majority of the action sequences were filmed at Wolf Hill Quarry.
Production Designer, Deborah Riley, said: "It's one of those things where you film something in another location and then you are responsible for finishing that location off somewhere else.
"You have to really do your homework and try and make sure that you match it as best you can, so then the director will have an entrance for the characters."
Warning: This video contains very strong language
The massive frozen lake which featured in the sequence was specifically created for the battle, meaning a huge team effort from everyone involved.
"When you stand up at the top (of the quarry) and look down, it was like we were building an airport or something - the scale of it is enormous," added Deborah.
Sam Conway, Game of Thrones SFX Supervisor, explained: "We had a tricky time trying to work out what a frozen lake looks like and how we can achieve that. And that went from the compacted quarry floor to putting concrete down for a nice flat finish.
"Then there had to be hues of colour, we had to work out how the ice would look - all these things were really, really tricky."
The massive project was well worth the effort however, with the epic battle becoming one of the main talking points of the series.
Actor Kit Harington, who plays Jon Snow, said: "It's a really cool set, an amazing set. They cemented a whole quarry to make it look like an ice lake" while Rory McCann, who plays the Hound added: "The amount of workmanship is incredible. We've had to run across that ice and it just looks so real, it's fantastic."
The final episode of Game of Thrones series seven is set to air on Monday.
A promo for the finale reveals some footage from a critical summit sequence involving several of the show’s main characters, who come together to potentially call an armistice in their war for the Iron Throne.
Belfast Telegraph Digital