Expedition to the underworld

On the shore of a once-out-of-the-the-way, and now forever the warm ocean, there were three bosomed friends: a master, an athlete and a scientist. In memory of the famous musketeers, we will call them an atose, portos and aramis, because, firstly, their real names do not have much importance, and secondly, they were really so always called, because they were inseparable, they were ready for a friend For a friend, they put their exploits and friendship above all ...
“Expedition to the underworld” - a ridiculous and fascinating “solo” story by A.N. Strugatsky - with rapid chase, time movements, fights with monsters - which was first published by him under the pseudonym of S. Yaroslavtsev