A new ship design has been unveiled by Norwegian Cruise Line for a series of next generation vessels.

The line has firm orders for four of the 3,300-passenger Project Leonardo-class ships for delivery from 2022.

NCL holds the option for two further ships to be delivered in 2026 and 2027.

Although details are sketchy, the new class of ships will build on the offering of freedom and flexibility found on the company’s most recent Breakaway-Plus Class ships, with “a host of innovative designs” promised.

A priority of the prototype design is energy efficiency, with the aim of optimising fuel consumption and reducing the impact on the environment.

Details of the 140,000 gross ton ships’ features will be announced at a later date.

NCL EMEA managing director, Christian Böll, said: “We are looking forward to this exciting new generation of ships.

“The new, breathtaking design will offer our guests a flexible on-board experience with an incredible array of offerings and further integrates inside and outside spaces, so they feel more connected with the sea.”