Shipping hazards are a major concern for those who work in the shipping industry. ICEBERGS, bergs, and reefs are all potential dangers that ships must be aware of when navigating the open seas. ICEBERGS are large chunks of ice that can be found in the Arctic and Antarctic oceans. Berg is a term used to describe any large piece of floating ice, while reefs are underwater formations of rocks or coral that can cause damage to a ship if it runs aground.