Survivor: San Juan del Sur — Blood vs. Water is the twenty-ninth season of the American CBS competitive reality television series Survivor. The cast is composed of nine pairs of loved ones, with relationships including parent-child, siblings, and partners (both married and dating). Notable contestants include former professional baseball player John Rocker, and two-time The Amazing Race contestants Natalie and Nadiya Anderson, who competed together on seasons 21 and 24. This season saw the return of Exile Island, which was last used in Survivor: Tocantins. In lieu of a reward challenge, a castaway and their loved one would square off in a duel. The loser is sent to Exile Island, while the winner earns reward for his or her tribe and must send one of their tribemates to Exile Island as well. The two castaways who are sent to Exile Island then have to choose one of two vases, where in only one has a clue to a hidden immunity idol located at their tribe's camp. Exile Island continued after the merge with one castaway exiled by the reward winners, where there would be a single urn with a clue to an idol hidden somewhere on Exile.