Carnival Corp plans to pull up anchor on seven more ships, but voyages will cost a little more for unvaccinated passengers on its Carnival Cruise Line brand.

The cruise behemoth will almost double its active fleet to 15 ships by October, but guests who have not been inoculated against Covid-19 will get hit with a $150 surcharge.

Brand president Christine Duffy said that the fee would be added to cover the costs of testing, reporting and health and safety screenings needed for unvaccinated passengers.