Neap

Neap hadn't always trusted the rising water.

Once, small on the flats, a great incoming tide had climbed toward him faster than he could scuttle, and the wall of rising sea looked like the end of everything. He froze, certain it would never stop.

An old, barnacled hermit crab had planted herself beside him, unbothered. "First big tide, is it," she said. "Feels like the end of the world when you don't know the beat yet." She nudged him toward a high crevice. "The sea isn't attacking you, little one. It's breathing. The moon pulls the water toward it, so the ocean heaps into a bulge on the moon's side — and, oddly, another bulge on the far side too, where the moon pulls the solid Earth away from the water. The spinning planet sweeps those two bulges past your shore, so you get two high tides a day. Watch the moon, not the water." They waited it out in the crevice, and sure enough the water rose, hung, turned, and went. And the drowning panic in Neap's chest loosened — because the terrifying wall had a name, and a cause, and a time it would turn around. It wasn't chaos coming for him. It was gravity, keeping a beat.

He clambered to DepthQuest at twelve, arriving right at high tide — naturally, because he'd timed the trip.

Marlin asked him one question. "What are the tides?"

Neap didn't answer straight off. He pointed a claw at the water's edge, held very still — and a full minute later, the next small wave reached exactly the pebble he'd pointed at.

"They're the ocean, pulled by gravity," he said. "The moon's pull raises a bulge of water on the near side, and inertia raises a matching one on the far side, and the turning Earth carries every shore through both — so, two high tides and two lows a day, like clockwork. The sun pulls too, weaker but real. When the moon and sun line up, at new and full moon, their pulls add together and you get the big spring tides. When they sit at right angles, at the quarter moons, they partly cancel and you get the gentle neap tides." He tapped the wet pebble. "It's the one part of the whole wild ocean you can predict to the minute — because it's just geometry and gravity, running on a schedule. I'm named for the gentle neaps. But I know the whole beat."

Marlin looked at the pebble, wet exactly on time. "You keep the sea's schedule better than my own clock," he said. "You belong here."

Neap's students were often the ones the rising water scared — the ones who'd heard the seas were climbing and pictured the tide simply never turning back.

One skittered in, claws clenched. "The sea's getting higher," she said, fast and tight. "The water's coming up and it won't stop, it's going to swallow the whole shore—"

Neap knew that clench. He'd frozen just like it once.

"Come sit on the rock a minute," he said. "Watch the beat with me." He waited through one slow out-breath of the tide. "There — see it turn and go back out? That still happens, every day. Now — you're right that the sea's average level is creeping up over the years, slowly, and that people who study the coasts take it seriously, and coastal towns are planning for it. That's true, and I won't wave it away." He nodded at the retreating water. "But that slow, decades-long rise rides on top of this daily beat — it doesn't replace it. The tide still turns. The change is slow, watched, and planned for; it isn't the tide forgetting how to go back out." He tapped the sand. "And you can't help a shore you've already imagined underwater."

She watched the water pull back down the beach, right on schedule. Her claws unclenched a little.