As the number of travelers cruising Antarctica swells, polar expedition companies are launching sustainable vessels designed for these bucket-list trips.

According to the International Association of Antarctica Tour Operators, approximately 56,000 tourists visited Antarctica in the 2018-2019 season, a 53 percent increase from the 2014-2015 season as per a NYT report.

“Climate change is a chief reason for the increased interest in visiting Antarctica,” said Mary Curry, a small ship cruise specialist and travel planner at Adventure Life. “We truly don’t know if the region will ever be as magnificent as it is now.”