The disparity the program is working against is documented and stubborn. Black children drown at rates significantly higher than white children nationally, a gap that researchers trace not to any natural aversion but to decades of exclusion from public pools, a shortage of nearby recreational water, and the compounding effect of families in which no one learned to swim passing that absence down. In a neighborhood like Bayview — which sits right on the bay, technically, though the shoreline there has never been set up for leisure — the proximity to water and the distance from swimming instruction can exist in the same zip code.

The program runs out of the Bayview Hunters Point YMCA on Hunters Point Boulevard, and its sessions are structured around safety first: what to do if you fall in, how to float, how not to panic. The more formal stroke instruction comes later. What the instructors are often addressing first is fear — a reasonable fear, given that many of the parents watching from the pool deck never had anyone teach them otherwise.

A commenter on a recent thread about the program put it plainly, writing about basic training in the Navy and the surprise of discovering that a quarter of a company needed remedial swim sessions before graduation — recruits who had enlisted in a sea-going branch of the military while genuinely afraid of open water. "It never occurred to my younger self," they wrote, "that urban dwellers didn't have the same access to swimmable bodies of water."

It's a simple thing to not have access to, until it isn't.

Someone walking past the Y on a Saturday morning would see the usual tableau: wet towels, kids in goggles too big for their faces, a parent or two with their shoes still on, standing at the edge.