The story concerns a field biologist working at "Trench Park" named Radnal vez Krobir. He is a citizen of Tartesh, a Homo neanderthalensis nation which seems to take in much of the west part of the Bottomlands and what in the real world is France and Spain. He is doing a two-year stint as a field guide to tourists from his and other nations who are visiting the Park to see the plants and animals there. During one of those tours, a military officer of the "Kingdom of Morgaf" is killed by one of the other tourists in his party. Radnal must call higher authorities to investigate the matter, and in the course of their investigation, they determine that the deceased man had a microprint in his effects outlining a plot by another nation to set off a "starbomb" near the "Barrier Mountains", thereby setting off one of the many geologic faults in the area, knocking a gap in the mountains, and reflooding the Bottomlands to form a new central sea, instigated apparently by Krepalga. Radnal and other characters eventually find who killed the Morgaffo officer and with the unwitting help of a koprit bird native to the Park, track down the location of the bomb, where it is defused. Koprit birds apparently have a habit of stealing bright shiny things; it stole the detonator wire from the bomb and used it to decorate its food-hoard bush to attract a mate, as the wire had been disguised as jewelry to smuggle it in past security. The conspirators had sabotaged all the tour party's transport, leaving them stranded far below sea level on the hot dry abyssal plain. This leaves a squad of Tarteshan secret police and police and army with the job of evacuating the tour party, by giving each member a big backpack tank of drinking water and marching them out; partway up to sea level a helicopter finds them and flies the party the rest of the way. The story ends with Radnal being honored by his fellow subjects of the "Hereditary Tyrant" of Tartesh at a great festival in Tartesh's capital Tarteshem, for saving the Bottomlands from certain destruction where he meets again a woman named Toglo zev Pamdal, who was in his tour party. She had told him she was a "distant collateral relative" of the Hereditary Tyrant but it turns out is actually his niece. They shake hands at the story's conclusion and presumably begin a romantic relationship. The story is told from Radnal's point of view and we see him describe Trench Park and its animals and plants to the tourists. Through these descriptions, we come to understand the unique geography and ecosystem contained within the Bottomlands and its Trench and how animals and plants would have adapted to a desert environment two kilometers below average sea level. We also see how the geography of the area would have been different from our timeline, including things like deep river canyons as the rivers around the Mediterranean would have incised such canyons in their descent down the old continental shelf; hydroelectric dams on such rivers generated 80% of Tartesh's electricity.
Publication history
The novella first saw print in January 1993 in the magazine Analog and has been reprinted thrice since then: the first time in 1997 in The New Hugo Award Winners, Volume IV; the second time in 1999 with a couple of other novellas in a book called Down in the Bottomlands; and the third time in 2015 in a collection of Turtledove's short fiction and essays entitled We Install and Other Stories.
