The Manacles is an extremely treacherous shipping area. Navigating the Inner Manacles with 2 tugs guiding a 10,000 tonne barge laden with rock armour several times a week, is surely an accident waiting to happen. If there was an accident, the oil pollution would impact on marine life, Coverack bay and beaches along this stretch of the Lizard.
In July 2010, a cargo ship visiting Glensanda super quarry in Scotland caught on fire. This could happen at Dean Quarry. A video of the fire can be found by following this link – Glensanda Pier Fire