Trench Collapse Emergencies: What to Do (and Not Do) After a Cave-In

When a trench wall comes down on a co-worker, every instinct says jump in and dig. That instinct kills. Trench walls that have failed once are very likely to fail again, and the soil near the collapse is disturbed, loaded and often wet. Would-be rescuers have been killed by a secondary collapse while trying to dig out a co-worker.

The first minutes

Why rescue is so hard

• Soil around a buried worker locks them in place. Pulling on a victim can cause further injury.
• Even partial burial can prevent breathing and cause crush syndrome, where releasing pressure can be dangerous without medical care.
• Professional trench rescue teams shore the trench first, using panels, struts and air bags, before they dig by hand.
• Utilities exposed or damaged by the collapse can add gas, electrical or flooding hazards.

Plan before you dig

The best rescue is one you never need, and the second best is one you planned for:

• Locate the nearest trench rescue resource. Not every fire department has a technical rescue team. Know who responds and how long it takes.
• Write the site address and access route where the crew can see it, especially on long linear jobs.
• Keep rescue equipment readily available where hazardous atmospheres could develop (1926.651(g)(2)): breathing apparatus, harness and line, basket stretcher.
• Make sure the crew knows the emergency action plan (1926.35): how to report an emergency, evacuation routes and who is in charge.
• Have first aid coverage. OSHA requires first aid supplies and trained personnel when medical care isn't reasonably accessible (1926.50).
• Make egress easy: ladders within 25 feet and inside the protected area, so people can get out at the first sign of trouble.

After the emergency

• Preserve the scene as much as safely possible for the investigation.
• Report to OSHA. Employers must report a work-related fatality within 8 hours, and an in-patient hospitalization, amputation or loss of an eye within 24 hours (29 CFR 1904.39). State Plan states may have their own reporting rules.
• Review what failed, fix it, and brief the crew before work resumes. Many states and OSHA area offices will also inspect after a serious trench incident.

Key takeaways

• Call 911 and say "trench collapse." Don't enter an unprotected trench to dig.
• Stop equipment, keep weight off the edge, and never dig with the excavator.
• Trench rescue teams shore first, then dig by hand.
• Plan rescue resources, equipment and access before work starts.
• Report fatalities to OSHA within 8 hours and hospitalizations, amputations or eye loss within 24 hours.

Last reviewed: October 25, 2026 · Free general education based on OSHA 29 CFR 1926 Subpart P. It does not replace the site-specific training and competent person your employer must provide, and it does not issue a certificate. Nothing you enter on this page is saved or sent.