Canadian-made Seaspan design chosen for U.S. Coast Guard's new icebreakers
Historically, Canada has usually depended on the U.S. for military and defence technology, using American-made aircraft, systems, and equipment to support its armed forces. It has been far less common for U.S. defence programs to rely on Canadian designs or expertise.
The new ships will be based on Seaspan’s Multi-Purpose Icebreaker design, a proven blueprint originally developed for the Canadian Coast Guard under the Government of Canada’s National Shipbuilding Strategy. The design work was completed almost entirely in Canada and is already finished, meaning construction can begin right away without years of additional planning or redesign for American authorities.
Concept of U.S. Coast Guard’s Arctic Security Cutters, based on Seaspan’s Canadian Multi-Purpose Icebreaker design. (Seaspan)
Concept of Seaspan’s Multi-Purpose Icebreaker design for the Canadian Coast Guard. (Seaspan)
These icebreakers are being built to handle some of the harshest conditions on Earth.
According to Seaspan, the ships will be able to break through ice up to four ft. thick and operate continuously for more than 60 days without returning to port. They will also have a long operating range of up to 12,000 nautical miles, allowing them to travel vast distances across the Arctic without refuelling.
Each Arctic Security Cutter will measure about 328 ft. in length — roughly the length of a football field — and 67 ft. in width. The ships will displace approximately 9,000 tons and carry a crew of about 85 personnel. They will be powered by a diesel-electric system that provides a total installed power of more than 10,000 kw, giving the vessels the strength and flexibility needed to move through ice-covered waters safely and efficiently.
Beyond icebreaking, the Arctic Security Cutters are designed to support a wide range of missions. These include national defence, protecting U.S. maritime sovereignty, scientific research, search and rescue operations, and maintaining a year-round presence in polar regions. The ships will also be equipped with modern communications, navigation, and mission systems to support these roles.
Concept of Seaspan’s Multi-Purpose Icebreaker design for the Canadian Coast Guard. (Seaspan)
Concept of Seaspan’s Multi-Purpose Icebreaker design for the Canadian Coast Guard. (Seaspan)
An important feature of the program is the shared design between the U.S. and Canadian Coast Guard fleets. Because both countries will be using similar ships and many of the same suppliers, the vessels will be easier to maintain over their lifetimes. This common approach is expected to reduce long-term costs and make it easier for the two coast guards to operate together during joint missions in the Arctic.
Seaspan says the shared design supports broader cooperation goals outlined in the trilateral ICE Pact framework, which aims to improve collaboration between Arctic nations. Using a single, production-ready design also helps ensure the U.S. Coast Guard can meet its delivery schedule and quickly expand its icebreaking capacity at a time when Arctic activity and competition are increasing.
Under Canada’s National Shipbuilding Strategy, Seaspan is currently building the largest portfolio of icebreaking vessels in the world, including a heavy polar icebreaker and up to 16 Multi-Purpose Icebreakers. So far, the firm has delivered four ice-capable ships to the Canadian Coast Guard, with its most recent delivery completed in 2025.
With the Arctic Security Cutter program, the U.S. aims to significantly expand its ability to operate year-round in the Arctic. Seaspan’s involvement highlights the growing role of cross-border cooperation and shared expertise in meeting the challenges of Arctic operations in an increasingly strategic region.
Concept of Seaspan’s Multi-Purpose Icebreaker design for the Canadian Coast Guard. (Seaspan)
Concept of Seaspan’s Multi-Purpose Icebreaker design for the Canadian Coast Guard. (Seaspan)
The deal also comes at a time of ongoing political and economic friction between Canada and the U.S., as both countries increasingly emphasize domestic production and reducing the reliance on each other as foreign partners. In that context, Seaspan’s role in a major U.S. Coast Guard program may appear to run against the broader political mood of limiting Canada’s dependency on the U.S., particularly in sensitive areas such as national defence and shipbuilding.
At the same time, the agreement reflects the practical realities of Arctic operations, where shared geography and rising regional tensions continue to drive cooperation. Growing attention on the Arctic — highlighted recently by heightened U.S. interest under President Donald Trump, including controversial remarks related to Greenland — has reinforced the need for capable icebreaking fleets and close coordination among allies, even as political relationships remain strained.