It is the largest habitat on Earth – and also the least explored. As world leaders prepare to meet in Nice for a major UN summit on the ocean's future, scientists say we still know remarkably little about what lies beneath the waves.
Just 26.1 percent of the global seafloor – including both shallow and deep areas – has been mapped using modern sonar, according to the Seabed 2030 project, which aims to chart the entire ocean floor by the end of the decade.
