I don't know how you knew, but you did. Good job!
As an aside, it's very hard to find pictures of Earth- surface collapsed lava tubes, though they are numerous on shield volcanoes. I happened to know that this island had some, and thanks to the wonders of Google, I found this picture of one.
It's very easy to find either pictures inside an old lava tube (such as the famous Thurston lava tube in Hawaii Volcanoes National Park) or pictures of active lava tubes, such as the ones continually forming during the current eruption of Kilauea in the same park. But ancient collapsed tubes at the surface just look like big ruts or trenches, and aren't very photogenic. It looks to me like the one on Ile Amsterdam had a few hornitos (small lava vents) along the way to the sea.