Some two decades ago, I remember seeing a news report about a weird tight-knit community of BASE jumpers in the USA who liked jumping from high bridges without

Some two decades ago, I remember seeing a news report about a weird tight-knit community of BASE jumpers in the USA who liked jumping from high bridges without parachutes. (The reportage was mainly about how they were addicted to this activity like to a drug, and wouldn’t stop even though several members had died.) In order to make the surface of the water safer to land in, they dropped a heavy object a split second before they themselves jumped, as supposedly once the surface had been broken by the splash of the initial object it was momentarily not concrete-like hard. Anyone else remember who this group was and has some information about them?