Related Clues:

• Divers' haunts
• Greener fish regularly spotted in coral banks
• Where convicts gather, nude, for bathing?
• Underwater hazards
• Submerged coral ridges
• Nautical hazards mean one takes in sail
• Groups of submerged rock
• Ridges of coral
• Playing free, skinhead rocks
• A thug hired in case of leaks in such sea areas
• Locales for many schools
• Menaces for mariners
• Sailing worries
• Some protective barriers
• Hull-damaging structures