The Port of Seattle Commission has approved a 10-year agreement that gives Carnival Corp., the parent company of cruise lines Holland America and Princess Cruises, preferential use of two new cruise berths to open at Terminal 91 in Interbay this April.

The deal — which can be terminated at any time by either party for the following cruise season — guarantees that the cruise companies will continue to bring their current level of 420,000 annual cruise passengers and base five vessels in the Seattle seaport through 2018.

You can see the work on the terminal from the Magnolia Bridge.