Oceans cover 71% of the Earth’s surface, but despite their immense size and impact on the planet, we know very little about them. While many of us might associate the sea with relaxing holidays on tropical beaches, the ocean is nothing but cold, dark and monotonous for most of the creatures that inhabit it.
The average depth of the ocean is 3.5km (the equivalent of crossing San Francisco’s Golden Gate bridge twice). Sunlight only penetrates up to 200 metres in crystal clear waters, and much less in murkier conditions. Beyond this depth, the world as terrestrial creatures know it ceases to exist, and life develops in total darkness. Welcome to the deep sea, the world’s largest ecosystem.
