Three Knocks at Night: The 1937 Jar Beneath Hollow Bend

Three Knocks at Night: The 1937 Jar Beneath Hollow Bend

Cold, rhythmic knocking in the dead of winter drew people out into single-digit temperatures: three knocks, a ten-second pause, three more, always from beneath the north floorboards. The sound persisted across a year, recorded in a forty-seven-entry log, and led to a buried sealed glass jar from 1937 - but who placed it there, and what the tiny key inside opens, remains unknown.

In this episode, we tell the documented chain of events from the first 2:47 a.m. report through the independent verification and the ground-penetrating radar finding, showing how routine notes and a runner’s log became the paper trail that cracked the case. How did a jar buried over four feet deep in 1937 cause nights of knocking in 2013-14, and why does the record end with a question?

Person: Nicole Holmes, 38-year-old electrician
Location: Hollow Bend Farm, outside Calverton, Indiana
Period: Winter 2013-2014 (sound began November 2013)
Case: Runner's log with 47 entries kept by Lisa Sheridan
Event: Sealed glass jar buried more than four feet underground since 1937

- The first recorded knock occurred at 2:47 a.m. on a night when the temperature dropped to 15 degrees.
- Lisa Sheridan’s runner’s log reached 47 entries by October 2014, each with date, time, air temperature, and sound description.
- The knocking pattern was three knocks, a pause of roughly ten seconds, then three more, repeatedly.
- A sealed glass jar buried more than four feet underground dated to 1937 contained a key and a folded document.
- Ground-penetrating radar and a soil engineer provided the physical explanation after a year of unresolved reports.

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