More than six miles above the Earth, special research balloons have captured some unexpected stratospheric sounds, Sandia National Laboratories say.

More than six miles above the Earth, special research balloons have captured some unexpected stratospheric sounds, Sandia National Laboratories say.

Breaking news and sounds from across the Middle Tennessee region.

Breaking news and sounds from across the Middle Tennessee region.

From the Tennessean Newsroom

Strange unknown sounds captured in stratosphere by research balloons

WARNING: Some listeners may find content disturbing. A substitute teacher calls 911 during the Covenant School shooting.

WARNING: Some listeners may find content disturbing. A substitute teacher calls 911 during the Covenant School shooting.

WARNING: Some listeners may find content disturbing. 911 calls during the Covenant School shooting

A staff member from the Covenant School places a 911 call to confirm the officer at the door was actually a Metro Nashville Police Department officer.

A staff member from the Covenant School places a 911 call to confirm the officer at the door was actually a Metro Nashville Police Department officer.

WARNING: Some listeners may find content disturbing. 911 calls from Covenant School shooting

WARNING: Some listeners may find content disturbing. Officer radio traffic from Covenant School shooting.

WARNING: Some listeners may find content disturbing. Officer radio traffic from Covenant School shooting.

Strange unknown sounds captured in stratosphere by research balloons

From the Tennessean Newsroom

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