Clint arrives on the Venice set of his movie The 15:17 To Paris

Clint Eastwood, 87, looked passionate about his latest project as he arrived on the set of his forthcoming movie, The 15:17 To Paris, in Venice, Italy, on Wednesday.

The widely-publicized film tells the real-life tale of three American heroes who thwarted a terrorist attack on a train in Paris, France, in August 2015 by bravely tackling an AK-wielding gunman.

Child actors will play the trio in flashback scenes as the movie sets out to explore who the men are and what drove them to react they way they did on that fateful day.

Eastwood looked relaxed as he brought the crew to the canal-bound Italian city on Wednesday, wearing light grey slacks and a dark grey polo, with a straw fedora to keep the summer sun off his face.

The octogenarian arrived in style, chartering an iconic water taxi to navigate the submerged streets.

Eastwood seemed happy and relaxed as he chatted to his crew on set as they prepared for another busy day of filming. The first filming day for 'The 15:17 to Paris' took place at Santa Lucia Station in Venice

The Thalys train was en route from Amsterdam to Paris, via Brussels; it is unknown what part of the story Eastwood was filming in Venice.

The film also stars The Office's Jenna Fischer in an as-yet-unspecified role, and Judy Greer, who according to Deadline will play 'an independent and fiercely religious single mother who always has a glass half full type of mindset'.

Eastwood himself met all three men at Spike TV's Guy's Choice awards in June last year, where he presented them with the Heroes Award.

Eastwood was widely praised for his decision to cast the trio in the movie.

Variety reported at the time of casting: 'Eastwood began a wide-ranging search for the actors who would portray the three Americans.

'The studio and Eastwood made their choices but at the 11th hour decided to have Sadler, Skarlatos and Stone portray themselves.'