Terrain hurts you when you commit to it before you have looked at it: low ground floods, steep slopes and cliff edges give way, ice and mud do not hold weight, and broken ground in ruins hides holes and sharp debris. Stop and read the ground ahead, choose the route where you can see your footing and retreat, and turn back instead of testing doubtful ground with your body. An injury you cannot treat, such as a broken leg far from help, is the real danger.
Part of Threat Assessment
Ground itself injures: floodplains, steep slopes, ice, mud and rubble each have a visible warning before they fail. In a collapse an injury such as a broken leg is the real danger, since no one may be able to treat it.
An Injury Is More Dangerous When No One Can Treat It
In a collapse, a sprain or fracture is not a short setback. You may be alone, carrying supplies, without transport or a hospital. The parent article lists a twisted ankle among the “mundane” threats that kill more people than dramatic ones. Terrain matters because it is the usual cause.
Ground Types and What to Watch For
- Floodplains and dry stream beds — low, flat, and where flood water goes. See Environmental Hazards.
- Steep slopes and cliff edges — loose rock, soil that can slide when wet, and edges that are undercut below and look solid above.
- Ice — thickness and quality vary across the same surface, and moving water keeps ice weak. Do not assume ice holds because it held yesterday.
- Mud, bog and soft ground — can trap feet and vehicles and exhaust you.
- Ruins, rubble and basements — hidden holes, exposed rebar, broken glass, unstable stacks of debris and floors that look intact and are not.
- Dense undergrowth and dead ground — hides trip hazards, and hides other hazards from your view. The parent article defines dead ground as areas you cannot observe from your shelter.
What You Need
- Sturdy footwear — it matters more than any other item here.
- A walking stick or pole — to probe ahead and test soft ground, mud or doubtful surfaces.
- Daylight — do not cross broken ground at dusk if you can wait.
Method: Read Before You Commit
Step 1: Look ahead before stepping onto doubtful ground Stop, scan, and choose the line where you can see where you place each foot.
Step 2: Probe Push the stick into soft ground or snow ahead of you. Test from a point where you can step back.
Step 3: Choose the route you can undo Prefer a path you can retreat along. Avoid routes where a mistake leaves no way back.
Step 4: Go slowly where it is bad One step at a time over rubble. Keep three points of contact on steep or loose ground where practical.
Step 5: Turn back If the ground worries you after two checks, stop. A longer route is cheaper than a broken leg.
Step 6: Mark it Add the hazard to your hand-drawn map so the group avoids it, as described in Local Terrain Analysis.
Common Mistakes
- Rushing at dusk — poor light hides footing. Stop earlier.
- Trusting ice or old floors because they look sound — appearance does not show strength.
- Going alone into ruins — an injured person alone and unseen is in serious trouble. Tell someone where you are going.
Thin ice, rubble and unstable slopes
A fall through ice into cold water can disable a person within minutes. If you cannot confirm that the ice will hold your weight, do not cross it. In rubble, avoid pulling out pieces that other pieces rest on, and stay out from under overhanging masonry or slabs.
What’s Next
- Learn next: Human Threats — the third category of threat
- Combine with: First Aid — when the terrain wins