The image shows a diagram of the Brent Spar. It shows a tall, cylindrical structure with approximately two thirds submerged in water. The lower section contained the oil storage tanks and above water are the living and working quarters with a helicopter landing deck. When the image is rolled over with the mouse it reveals information about the structure.

Total mass of structure: 14,500 tonnes.
Built in 1976, 147m in height and 29m in diameter.
Crude oil storage tank capacity: 50,000 tonnes.
Remaining after decommissioning: 56 tonnes of lead and other heavy metals; estimated 50 tonnes of oils and wax in tanks; low level radio activity in pipes.

This information can be used to answer the quiz later on the page.