Rashi cites the Talmud in Sanhedrin 110a, that Moshe said, “If G-d created an opening into the earth during the six days of creation, good. If not, let Him create one now.” The Talmud continues beyond Rashi’s citation. Koheles 1:9 says that there’s nothing new under the sun, i.e., G-d doesn’t create new things! The Talmud therefore revises its understanding of Moshe’s request. He said, “If the opening is here, good. If not, please move it here.”