Story: Manuel Losada | Illustration: Santipérez | Based on an idea by Luis M. Rosales

WHAT REMAINS WITH THE TIDE

It appeared after an extreme low tide, the kind that leaves the estuary bare in areas that usually never see the air.

The sea had pulled back further than it should have. The bottom lay open like a long wound of black mud, old ropes, forgotten hulls, and remains that should no longer hold their shape.

The first to see it thought it was a fallen structure.

Something large, leaning on its side, half-covered in dried seaweed. Neither animal nor machine. An irregular volume with bent protrusions and a central curvature like an open hull.

It did not move.

The strange thing was its skin: not wet, not dry — a viscous, matte layer, like dull oil.

Then it breathed.

Not with the expansion of a chest, but through lateral waves that rippled across its entire body, slow contractions that traveled from one end to the other, as if air were moving through internal channels.

It was the size of a small van.

It had no distinct head. The front end opened into five overlapping cartilaginous plates, resembling thick petals. The translucent membrane revealed dark veins moving inside. They opened and closed at a slow rhythm, filtering air and scent.

There was no mouth underneath.

Instead, there was a dense field of short filaments that vibrated with the wind and retracted whenever something cast a shadow over them.

The sides were supported by six articulated columns, too thin for the weight they held. Yet, they maintained constant tension, flexing and hardening according to the load. Each support dug into the silt and adjusted its position with continuous micro-movements.

It did not walk: it repositioned itself.

Each advance was a complete reorganization, as if its own structure recalculated itself before touching the ground again.

At the rear, it dragged a mass of flat, overlapping appendages, like nets of thin flesh. They opened with moisture and closed as they dried. Shells, plastics, and pieces of rope remained stuck to them — not trash, but living camouflage.

No eyes were visible.

But at different points on its surface, clearer circular zones emerged—gel windows beneath which liquid shadows moved, oriented toward movement.

It did not look: it measured densities.

When one of the onlookers stepped back, the entire body responded. The six columns sank a little deeper. The front plates opened slightly. The filaments all oriented in the same direction.

It had detected mass. Distance. Presence.

The sound it emitted was neither a scream nor a call. It was damp friction, like two large surfaces separating very slowly.

Bubbles began to rise from the mud beneath it.

It was not beached.

It was anchored.

And it was waiting for the water to return.

“It’s no fish…” someone murmured, and the sentence remained unfinished in everyone’s memory.

The creature began to move, slow and precise. Not toward the people, but toward the line where the tide would return first.

Each repositioning left a perfect mark on the bottom: a sunken hexagon with filaments printed around it, like an organic seal.

When the water rose, it was gone.

Only the six prints remained, and a dark film floating on the surface, motionless, reflecting nothing of the sky.

Since then, during some extreme low tides, those marks reappear.

Always six.

Always oriented toward the open sea.