Naufragio literally translates to "shipwreck". It's a powerful and dramatic word that you don't hear in songs every day.
In this song, Ana Torroja uses it metaphorically to describe being led to another emotional disaster. She sings, "Me llevará su luz a otro naufragio más" (Its light will lead me to another shipwreck), creating a vivid image of being repeatedly drawn into destructive situations despite her attempts to escape.
This song is about someone who keeps getting pulled back into a relationship they know is bad for them, even after they've tried to walk away.
The singer compares this pull to a shipwreck, a fire, and a tunnel with no end. Every time they try to escape, they end up back at the same person. The lines about a shipwreck and a "beacon" that guides them straight into danger capture how something that should be a warning sign instead feels like an invitation.
By the end, the singer admits they're tired of lying, mostly to themselves, about being able to just leave for good.