HBO has been taking great measures to keep "Game of Thrones" season 8's filming in secrecy. However, eagle-eyed fans prove they cannot be stopped as photos of a new set being constructed in Moneyglass emerged online.

The series' fan site Watchers on the Wall reported there is a new construction seen at the newly revamped set of Winterfell. There are also some surprisingly known characters filming near the ancestral home of House Stark, and this happens to be the Unsullied.

The last time fans saw the elite warrior-eunuchs was when they were at Casterly Rock, while the others were at Highgarden. In the production of "Game of Thrones" season 8, they are seen holding new spears with pointed tips, which are believed to be dragonglass-made weapons.

To recall, Jon Snow (Kit Harington) was able to convince Daenerys (Emilia Clarke) to let him and his men mine dragonglass deposits on Dragonstone. With this, the Unsullied may very well be ready for battle. 

This, too, led to a truce between the King in the North and the Mother of Dragons. Meanwhile, for the past month, the show's staff and crew have been preparing the set of Winterfell for "Game of Thrones" season 8. This time, it is complete with operational battlements for the actors. 

Even the fields where the Battle of the Bastards happened are now being prepared to be snowed upon. To ensure everything is kept under wraps, security within the set try harder to keep actual actors away from prying cameras. 

 "Game of Thrones" season 8 is expected to be released in 2019 on HBO.