Related Clues:
- Playing free, skinhead rocks
- Locales for many schools
- Menaces for mariners
- Antarctic floaters
- Largely submerged threats
- Sailing worries
- Some protective barriers
- They may come off the shelf
- North Atlantic perils
- Arctic shipping hazards
- Frigid water hazards
- Hull-damaging structures
- Snorkelers' spots
- Hidden hazards for boaters
- Hidden hazards off shore