If size really mattered, the whale, not the shark, would rule the waters.
Beyond their immaculate design, the reason sharks rule the ocean is their complete indifference to everything except feeding, procreation, and defending their territory. The shark does not love. It feels no empathy. It trusts nothing. It lives in perfect harmony with its environment because it has no aspirations or desires. And no pity. A shark feels no sorrow, no remorse, hopes for nothing, dreams of nothing, has no illusions about itself or anything beyond itself.
You can change direction if you feel like you have missed your way... Decide to do that now! Go back a little more and begin from where you missed it out! If only you are ready to rise again, you can make a right decision in that tight belly of the shark. Jonah did that earlier!
They dived into the ocean of shadow and smog, adding to it with the fumes of their own aircraft. The goggles were useless now, but Jacob kept them on, in case there might be some break in the murky pool. It was fitting that the Worldwaker had passed through there, with the shark emblem painted on brightly. In those deep waters it could not be seen. It almost felt like it had lured them in. The dolphins do not hunt the sharks.