Even if you wait for the best time of year and scope out the perfect spot, seeing the Northern Lights in person is never a guarantee. The visibility of the aurora borealis on any given night depends on multiple factors that are tough to predict. But one cruise line is confident they can take you to the light show—so confident that they’re promising a second trip on them if you miss the Lights the first time, Travel + Leisure reports.

The Astronomy Voyage from Hurtigruten Cruises leaves Norway between October and March, traveling from Bergen to the Arctic town of Kirkenes and back. During the 12-day tour, passengers are treated to views of Norwegian landscapes and wildlife and, if all goes according to plan, the Northern Lights in all their glory. In its first 10 years, the voyage has never gone all 12 days without at least one clear look at the aurora borealis, but if year 11 marks a break in that pattern, customers have no reason to worry. Hurtigruten promises to send them on a free six- or seven-day cruise next year to give them another shot at the experience.

“We know that no trip to the Arctic Circle is quite complete without experiencing this highlight (pun intended!) at least once on your journey,” the website reads, “so your Hurtigruten experience will be one with zero regrets.”

When passengers aren’t sky-gazing on the deck, they can sit in on presentations from the ship's own onboard astronomer or visit the Tromsø Planetarium (the northernmost planetarium in the world) during one of the ship’s many stops. Admission to the planetarium is included in the roughly $1,970 ticket price, along with meals and access to an English-speaking tour guide. The aurora borealis guarantee is also included in the fare, but considering that the current season is projected to be one of the best for viewing the Northern Lights until 2025, it’s likely that no one will need to redeem it.

[h/t Travel + Leisure]