Visit a Cold War Crater in Mars Bluff
Visitor update — October 29, 2026: The crater is on private land. No public entrance has been verified. Do not follow the old directions below, go onto the property, or approach the private home. The roadside historical marker and the Florence County Museum are separate public places; check their current visitor information independently.
On March 11, 1958, a B-47 aircraft accidentally released a Mark 6 weapon over Mars Bluff, South Carolina. Its conventional explosives detonated on Walter Gregg’s property, creating a crater and damaging the family home. The weapon’s nuclear core did not detonate. The incident is remembered through a roadside historical marker and artifacts held by the Florence County Museum; neither provides access to the private crater.
Sources: Discover South Carolina; Florence County Museum.
UnusualPlaces Field Notes
- Location
- 1958 Mars Bluff bomb crater, Florence County, South Carolina, USA; crater is on private land. The roadside historical marker is a separate public feature.
- Access
- The South Carolina tourism authority says the crater is on private land. No public entrance or visitor permission is documented; do not enter the residential property or follow unofficial paths. A state historical marker stands by the highway, but it is not the crater and does not grant access to the private site. The Florence County Museum displays related artifacts at a separate public venue.
- Admission
- No public admission is offered for the private crater site. The separate roadside marker has no ticket, but it is not access to the crater; check the Florence County Museum separately for its own visitor terms.
- Time needed
- No public crater visit duration is established because the impact site is private and no visitor access is documented. The marker or museum are separate locations with their own visit times.
- Best season
- No public visiting season is established for the private crater. Do not approach without explicit permission from the property owner.
- Opening hours
- No public hours or entrance are listed for the private crater. The roadside historical marker is separate; the Florence County Museum has separate visitor hours.
- Facts checked
- 2026-10-29
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