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.
Sharks do not urinate as most animals do. Sharks convert urine to  urea; a toxic compound which is really converted ammonia. Urea is  absorbed in the flesh of the shark and â¦expelled through the skin.  When a shark dies this urea is converted back to ammonia.