Answer
The answer to the question is "Przhevalsky didn't discover any sea". This is because Przhevalsky was a Russian explorer and geographer who was active in the late 19th and early 20th centuries. He is best known for his explorations of Central Asia, during which he discovered several new species of animals, including the Przhevalsky's horse and the Przhevalsky's gazelle. However, he did not discover any seas.