Portugal's Mystic Invest has ordered two more cruiseships at the domestic WestSea Viana Shipyard.
Cruise Industry News reported that the company is expanding its move into the expedition market.
The two 9,300-gt vessels will carry 200 guests.
The company, run by president Mario Ferreira, will see its first ship, the 10,000-gt, 176-berth World Explorer, debut in February 2019.
The new sisterships, World Voyager and the World Navigator, will come in 2021 and 2022, and are valued at EUR 60m ($67.75m)