wingsandsword said:Just the distance required to travel through the core with anything in the water would have taken too long to be plausible, and even if planetary physics didn't scream "NO", then the pressure of a thousands-of-miles-deep ocean would crush virtually anything. Realize how deep the pressure is in the ocean after just a few miles, then think of something 1000 times deeper.
Then realize that since they've got faster than light travel, technology suitable for blowing up planets in one shot, and at least one form of "magic", we are already committed to breaking the laws of physics. Crushing depths can be handled by suitably strong materials, and distances spanned in short times with suitably powerful engines. Compared to the other violations of physics, these are hardly notable.