Shark Counterattack

It was a hard battle which did much to blood and bone, but the villagers subdued the great shark and killed it. They then looked upon it and wondered, full of anger and bafflement, what use they could make of it.
Till Ollepor had his inspiration. "We can bear no more of this, and this is our opportunity to stop it." He hollowed out the shark. He took out its guts, and he firmed up the insides with beams, and he made the tail a rudder too. He made the fins into oars and did everything else necessary.
Then he bade the villagers, the brave ones, the strong, to gird themselves and enter the shark with him. Together they sailed forth and down, far below to the seat of the sea king where they offered battle. Spear went against spear and net against net, and in the end the veterans who had defeated the sea's heroes before did so again.
"I am defeated," the sea king confessed. "And what now?"
"Now, rain," Ollepor demanded, and so it was done. The clouds took away great gallons of water so that the village soon sat on a cape. The sea king sent the villagers back and along with them another shark filled with gifts, and ever since the war shark and the treasure shark were the symbols of the village, later a town and then a great city.
Finis

The Next Thing in Publishing

The page margins will be made up to look like it's a heads-up display, periscope, binoculars, or other immersive framing. For fantasy? Illegible marginalia.

Nautical Advice

If you want to write a submarine story, make sure to give it little legs or wings. I know you think you have enough ideas for underwater stuff, but you don't. Keep your options open.

Addender

Submarines are an area of divergence between fantasy and science fiction. Submarine fantasy is fresh, exciting, and full of possibilities. Submarine scifi is full of boring technical details and horrible underwater creatures that the author alone thinks are wondrous elements of nature's beauty. As for submarine alt history, U-boats perform very well in it.

Try Not to Cry for Joy When You Read This

Submarine Fantasy

Addendum

Submarines also.