After an early-morning visit by a team of reporters from TV4 Sweden, we conducted two dives around the island of Holmön. The first dive was rather unexciting: a flat seafloor that stretched almost to the shore and only a few species to document. The second dive, on the other hand, was far different: abundant marine plants—some, up to two meters tall—as well as a number of invertebrates that are often associated to the plants, like snails.

Like in other seas, it’s difficult to determine what you’ll see on a second dive: a completely different seafloor, its orientation based on the waves or current, or a whatever other variable that we’re unaware of, is enough to make the sea life of two nearby places completely different. And, as the days pass, this uncertainty is always a good thing.