The Port of Seattle Commission endorsed Monday more study of a tunnel to replace the Alaskan Way Viaduct, "as a package with improvements on the surface streets, Interstate 5 and transit."

The Port of Seattle Commission endorsed Monday more study of a tunnel to replace the Alaskan Way Viaduct, “as a package with improvements on the surface streets, Interstate 5 and transit.”

In a unanimous motion, commissioners said the options recommended by transportation planners last week are flawed: A surface option would not meet the needs of shipping and cruise industries; an elevated option might limit downtown-to-waterfront connections.

Commissioners said a “subsurface hybrid” plan would provide capacity for future growth, create jobs and enhance the waterfront.