The Red Line was truly high. Even propelled by the powerful currents of the West Sea, it still took half an hour to reach the summit. The main reason was that the routes from the Four Blues into the Grand Line via Reverse Mountain were not the same.
Due to the Red Line's terrain, the routes from the West Sea and North Blue into the Grand Line were the longest among the four canals. Those two canals were roughly the same length.
The South Blue canal was somewhat longer than the East Blue canal, while the East Blue canal was the shortest of the four.
Among the four great seas, the World Government's control over the East Blue ran the deepest. Even so, it was nowhere near that of a modern state, not even comparable to the ancient feudal prefecture-and-county system.
After reaching the summit, the massive hull of the Dark Moon sailed straight out of the canal, tracing a graceful arc through the air before crashing into the violent currents where the four canals converged. The ship shuddered violently, sending up enormous sprays dozens of meters high.
Without Carlos needing to give orders, Riley maneuvered the Dark Moon through a slight turn, smoothly guiding it along the currents of the Four Blues and into their sole outlet—the canal at the entrance to the Grand Line.
The climb had already been thrilling, but the descent was even more so. On the way up, there had only been the current from one sea; on the way down, there were four currents. Their speed became utterly astonishing, far more exhilarating than street racing. The scenery on both sides flashed backward, and Carlos could not help being the first to shout, venting his excitement to his heart's content...
Soon, the others could no