Turns out a short-lived emergency incident on the 911 log in the 3400 block of West Marginal Way (map) last night involved a sunken tugboat at Terminal 5; one person went to the hospital (but is out already). The state Ecology Department has just reported it, as follows:

The state Department of Ecology, U.S. Coast Guard and NRC Environmental Services (NRC-ES) are actively working to raise the response tug Sea Born that sank Saturday night at Terminal 5 in Seattle .

The NRC-ES tug had an estimated 200 gallons of diesel fuel in its tanks when it sank around 10 p.m. last night after high waves inundated the stern of the vessel. This morning, responders found the tug upright underwater near the location where it sank at Terminal 5.

Earlier this morning, responders spotted a light, unrecoverable sheen of diesel fuel on the water near the location where the Sea Born sank. Oil containment boom and absorbent materials were placed on the surface as a precaution. All petroleum products, including diesel fuel, are environmental toxins.

Divers from Ballard Diving have conducted an underwater assessment of the tug. The fuel vents are small and state, federal and private responders do not anticipate further leaks from the tug.

NRC-ES is planning to lift to the Sea Born out of the water with a crane barge as soon as possible today.

One person was on the tug when it sank Saturday night. That person was taken to Harborview Hospital and later released.