Maritime High School Highline district will open maritime-focused high school in the fall By Ashley Gross • Jan 12, 2021 Courtesy of Northwest Maritime Center Listen Listening... / 1:07 Eighth-graders in Seattle and South King County trying to figure out where to go to high school will have a new option to consider. A regional high school focused on marine science and maritime careers will open in the Highline school district in the fall.