Eden Project horticulturist John Nichol throws down ropes as he moves above the canopy of the Rainforest Biome using a helium balloon. The tethered balloon allows the team of gardeners at the Cornish attraction the chance to reach the top of the canopy in the Biome - which is the biggest greenhouse in the world - so they can prune fast-growing trees such as balsa and kapok, which have reached the 50m ceiling. The Rainforest Biome is the larger of Eden's two covered biomes, and is 100 metres wide, 200 metres long and 55 metres high and contains tropical plants such as banana trees, coffee, rubber and giant bamboo

Credit : GETTY