Watch out for rocks , obstructions , and the occasional splash of muddy water from the Mudder crawling ahead .
Trench Warfare : This military - style obstacle requires Mudders to crawl through narrow , dark , muddy trenches .
Watch out for rocks , obstructions , and the occasional splash of muddy water from the Mudder crawling ahead .
Trench Warfare : This military - style obstacle requires Mudders to crawl through narrow , dark , muddy trenches .