"Senior... May I ask a few questions?" Yuan Wenren looked curious about the story just told.
"No need to be so formal, feel free to ask any questions," Xiang Shan replied, "After all, our journey is quite long, chatting is nice."
This is really a sad truth. Although humans can travel at a few percent of the speed of light in outer space, there's not much improvement in speed underwater. It's difficult to move quietly.
With a reactor to power, submarines could indeed go faster, but then there's no point in sneaking underwater.
In this era, making too much noise easily draws attention.
Because now, there aren't many animals left in the vast sea.
Many years ago, Yawgmoth made a final attempt to save some marine life. Assuming those creatures still exist, they must be confined to areas near the equator.