A great location is wasted and a true piece of Barcelona lore is exploited and clumsily “explained” in “Last Stop: Rocafort St.,” a supernatural thriller from director and co-writer Luis Prieto.

There really is a subway stop where suicides are not rare, but “Estación Rocafort” — which is also the Spanish title of this film — somehow finds the most far-fetched and not-quite least frightening version of what could cause such a phenomenon.

Japan has its  Aokigahara Forest, a “haunted” magnet for suicides and the subject of several supernatural thrillers (“The Forest” is the best known abroad). Why not an exploration of that sort of mystery in the haunted underground of Barcelona?

Prieto & Co. take the bare facts of the suicides and add a possessed murderer — “The Yellow Line Killer” (Celso Bugallo) — who might provide clues as to why so many die there from his prison cell, an e- cop (Javier Gutiérrez) haunted by what he experienced confronting this killer and a young Mexican immigrant (Natalia Azhara) who needs a job badly enough that she accepts, as the newbie, the assignment of working the night shift in this creepy corner of Barcelona’s metro.

But the occasional inventive picture framing and upside down camera angle capturing the tunnels disappearing into the inky black distance and the cavernous and spookily empty station itself (nobody rides the Metro during Laura’s shift…apparently) doesn’t compensate for the film’s thin plot, lead-footed pacing, limited peril and the lack of hair-raising incidents in its 89 minutes.

Laura lives with a roommate who also works on the subway but frequently visits the aunt who is the main reason she moved here after the death of her mother. She doesn’t know much about the city, and to the film’s detriment, it spends no time introducing her to it. And she certainly doesn’t know Rocafort’s “history.”

The opening scene introduced a couple of cops racing to stop The Yellow Line Killer from murdering an entire family in the tunnel near that station decades before.

“They’re COMING for me,” the killer cries (in Spanish with English subtitles) after he and his victims see the blind stray dog meant to be the harbinger of death for those who kill themselves, or are killed at Rocafort.

Laura and her friend-with-benefits Cris (Valèria Sorolla) start asking around about the strange things the young woman is seeing while walking the station and monitoring its CCTV. That brings them to books on the subject, one of them written by former Det. Román Azpuru (Gutiérrez), who crawls out of the bottle long enough to renew his work on the case that ended his career and took away his last good night’s sleep.

Laura learns a new word — “esotericism” — and the embittered ex-cop stumbles into clues of an ancient and supernatural nature that point them to a closed amusement park whose rides are stored underground.

There are many promising directions this story could have taken, any one of which could have made use of the city’s iconic locations and figures from its history. But no, let’s stick with the underground settings and settle on the safest, most uninteresting “solution” to the haunting.

A few jolts are provided with the editing and Azahara’s ability to hit just the right pitch in her bloodcurdling screams, which always take us by surprise. I liked the Chinese bar milieu that our sauced detective has lost himself in.

The subplots are barely developed and the resolution so frustrating I’d hate to get lost in thoughts on this film while standing too close to the edge of the platform. “Last Stop” doesn’t take away your will to live. But it does give you reason to wish you’d never settled in for a thriller this disappointing.

Rating: unrated, violence, some of it against children, nudity and profanity

Cast: Natalia Azahara, Javier Gutiérrez, Valèria Sorolla, Xavi Sáez and Celso Bugallo.

Credits: Directed by Luis Prieto, scripted by Ivan Ledesma, Ángel Agudo and Luis Prieto. An Omnibus Films release.

Running time: 1:29