Seaspan this week made public its work on a big new container ship powered by ammonia, in an attempt to address concerns about the toxic fuel.

The giant Canadian shipowner has produced a report with the Maersk Mc-Kinney Moller Center for Zero Carbon Shipping to unveil the design for a 15,000-teu neo-panamax prototype.

The partners detail their design decisions and the challenges that still need to be met to get the ship on the water.