Anybody have an idea about what this might be? Just south of Point Defiance, in the Tacoma Narrows, there’s this line of escaping bubbles coming from below the water. I’ve seen them before, but on this occasion they were really firing. They form a fairly straight line of about 200 meters or so, possibly longer, and it seems like there is a lot of gas bubbling up over that distance.

My guess is some sort of fracture in the sub-marine layers, a pocket of methane or CO2, periodic changes in pressure bringing different levels of output… but I don’t really know anything. If you do, I’d love to hear about it.