Importing Ocean Water to Mars

In a previous "What If" video, we confronted the theoretical scenario in which the oceans were drained. As an aside in that video, Randall Munroe explained the lack of water in a throwaway manner, saying it was sent to Mars. But that made viewers wonder what that would do to Mars. We know that Mars once had plenty of water, and still may have a significant amount, but the surface is almost all dry. So let's look at that scenario, even though it will never happen. We have enough trouble sending robots to Mars. (via Laughing Squid)