The most recent leg of the mission, carried out via an exploration vessel called the Nautilus, surveyed the massive Eratosthenes Seamount (an underwater mountain), which covers an area more than 120km long by 80km wide and stands 2, 000m high.

BBC: Mapping new worlds

This year, balloons can be no larger than 70 feet high, 78 feet long and 40 feet wide.

CNN: balloon

The 360-tonne unit is more than 18m (60ft) long, 5m (16ft) wide and almost 6m (20ft) high and is scheduled to begin generating power in March.

BBC: St Sampson's Harbour due to close for generator delivery

The generator transformer - measuring over 13ft (4m) high, 29ft (9m) long and 13ft (4m) wide - contains more than 30 tonnes of copper and around 120 tonnes of steel.

BBC: Oldbury power station transformer is removed from site

Aamer swapped ends but was pummelled high over long-on for six by Shah, and carved over wide mid-off by Pietersen for the fifth maximum of the England innings.

BBC: Revitalised England beat Pakistan