Netflix has released the official trailer for The Union, a spy action comedy-thriller featuring Halle Berry and Mark Wahlberg that was partly shot in Piran, the picturesque Slovenian seaside town.

Directed by Julian Farino, the film is due to be released by Netflix on 16 August, but excerpts from several scenes filmed in Piran can be seen in the trailer.

Wahlberg plays Mike, a construction worker from Jersey, who is thrust into the world of super spies and secret agents when his high school ex-girlfriend Roxanne, played by Berry, recruits him on a high-stakes US intelligence mission.

The Union was filmed at several locations in Slovenia, mostly in Piran, with a total of 17 days of shooting planned.

More than 340 Slovenian film workers were engaged in the project, counting for over half of the entire crew. They were involved in the organisation, production, set design and in the technical crew, as well as assistants in the costume and makeup and picture and sound divisions.

Hundreds of extras were also involved, as well as a number of apprentices. Including Slovenian and foreign film workers, actors and extras, the project was estimated to number 1,500 people. The cost of preparations and filming in Slovenia was estimated at €10 million.

The shooting of the biggest film project in Slovenia yet was hailed by Culture Minister Asta Vrečko at the time as an important event for the Slovenian film industry.

Netflix is a leading subscription video on-demand streaming service, having 270 million subscribers in more than 190 countries.