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Although the campus gets locked up tight, it lacks a burglar alarm, and security cameras have arrived but have not yet been installed.

Some use light to startle predators, “like a burglar alarm,” and others use it to lure prey, as anglerfish do, said Quattrini, who is curator of corals at the Smithsonian National Museum of Natural History.

Most modern home security systems rely on a Wi-Fi signal for burglar alarms and surveillance equipment, including doorbell cameras.

Authorities say the men broke into the house in July 1969 in a bid to steal a coin collection, but were foiled by a burglar alarm.

The first possible sign of Cavalcante that alerted searchers shortly after midnight Tuesday was a burglar alarm.