I think a lot of scientists worldwide wondered whether this particular subduction zone - the Japan trench, the southern part - could ever produce a great earthquake.

我想世界上有很多科学家都想知道这一俯冲带——日本海沟南部——是否会发生一次大型地震。

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The threat of earthquakes are not new to the area - the US Geological Survey reported that the Japan trench has had nine earthquakes of 7 magnitude or greater since 1973.

地震的威胁对这一区域来说并不新鲜——美国地质调查局报告称，日本海沟自1973年以来已经发生过9次7.0级以上地震。

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Researchers have discovered a potential new species of comb, or ctenophore, jellyfish near the Ryukyu Trench near Japan.

在日本附近的琉球海沟，研究者们发现了栉水母的一个可能新种。

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While manned exploration had until now seen a 52-year hiatus, scientists have used two robotic unmanned vehicles to explore the Mariana Trench: Japan's Kaiko made a dive there in 1995 and the US-based Woods Hole Oceanographic Institution's vessel Nereus explored the deep in 2008.

BBC: James Cameron back on surface after deepest ocean dive