What was the corresponding impact on the Atlantic?
As the Atlantic poured into the Med, it lowered worldwide sealevels a tad, because the oceans are linked.
When the Russians were checking the bedrock prior to the Aswan High Dam construction, they found that the Nile was atop a silted-in canyon, the date of which is (ta-da!) the same as the period of time that the Med was much lower and not connected to the Atlantic.
They built the dam anyway. ;’)