What diseases were there in the trench in World War 1? Trenche foot was very common in the trench warfare. caused from wet feet and not being able to change their socks and boots. Edit
Repels Sharks No.........human urine actually repells sharks and other fish.
Coral reefs! As with the relationship between human urine and sharks, it is difficult to find academic research on the impact of human urine on coral reefs. However, there is anecdotal evidence to suggest that it may be an issue.