NASA's Crew-7 mission made re-entry into the atmosphere and landed in the Gulf of Mexico early Tuesday.
Dozens of residents in Shelby County reported hearing a big boom Monday morning, but authorities are unsure what caused it.
The SpaceX Dragon crew capsule splashed down in the Gulf of Mexico Tuesday evening around 10:07 p.m.
An unusual boom was felt and heard just after 11 a.m. Friday in south Alabama. Meteorologists, first responders and news media received hundreds of calls about the boom and shake from a widespread area.