On the shore of a once-icy, but now forever warm ocean, there lived three bosom friends: a master, an athlete and a scientist. In memory of the famous musketeers, we will call them Athos, Porthos and Aramis, because, firstly, their real names do not have much meaning, and secondly, they were really always called that, because they were inseparable, they were ready for each other for a friend, they put their friendship above all else on any feats... “Expedition to the Underworld” is a funny and exciting “solo” story by A. N. Strugatsky - with fast chases, time travel, fights with monsters,◦ - which was first published by him under the pseudonym S. Yaroslavtsev.