We actually use the fuel for the process. Their process is creating a heavy fuel oil that works for marine vessels.

我们实际上会用燃料来进行这个流程。这个流程会产生重油，用于海洋船舶。

But there are other more likely ways they made the journey: Big marine vessels, like container ships, need ballast water to retain their stability after they've offloaded their freight.

但它们还有其他更可能的方式完成旅程：大型船舶，例如集装箱船，在卸下货物后需要压载水来保持稳定性。