Cruise fans are ready to get back to sea, and Royal Caribbean is seeing that demand in the form of people volunteering for test cruises.

In less than a week, Royal Caribbean President and CEO Michael Bayley shared on social media that Royal Caribbean has received over 100,000 people sign up as a volunteer for its test cruises through an online form.

The sign ups are for test cruises that the U.S. Centers for Disease Control and Prevention (CDC) require cruise lines to conduct prior to regular cruises being approved for restart in the United States.

On Thursday of last week, Royal Caribbean published an online signup form to allow anyone who is at least 18 years old to sign up after receiving thousands of inquiries from the public about how they could sign up to be a test cruiser.