There’s a ghost ship in The Witcher 3. If you’ve never seen it, you’re not alone – it only shows up at a specific time in specific waters around Skellige, and the potential encounter lasts only a handful of moments. Every time the topic comes up, many players recount their hundreds of hours playing without ever seeing the ship. That includes today, when CD Projekt tweeted about the ship for The Witcher games’ 11th anniversary.

Ghost ship sightings are typically reported around the small islands between An Skellig and Hindarsfjall on the Skellige map, just past 1AM in-game. The ghostly blue transparent ship turns up precisely once each day before submerging beneath the surface. You can’t board it, dive after it, or meaningfully interact with it in any way – it’s just a bit of late night spookiness for flavour.

The tweet is the second of 11 Witcher facts promised for the 11th anniversary of the first game’s release. We’ve also got some sweet concept art of Triss, showing the designs leading up to her final outfit in The Witcher 3.

Whether or not you’ve noticed the ghost ship in all this time, some players have certainly have. You can see the encounter for yourself below.

While you’re chasing ghost stories, look out for that Cyberpunk 2077 release date. There’s little doubt CD Projekt’s next massive project will contain a similarly impressive array of secrets to discover and surprises to see.