DEEPEST OCEANIC TRENCH

Deepest oceanic trenches

The following are the deepest known oceanic trenches on Earth:

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The Challenger Deep

• The Challenger Deep, located in the Mariana Trench in the western Pacific Ocean, is the deepest known location in the world's seas, reaching a maximum depth of around 10,925 metres (35,843 feet).
• It is named after the HMS Challenger, which conducted the trench's first scientific investigation in 1875.

Hossack Deep

• Hossack Deep, located in the Tonga Trench in the South Pacific Ocean, is the world's second-deepest known point, reaching a maximum depth of roughly 10,052 metres (32,970 ft).
• The trench was named after the HMS Hossack, which undertook a scientific investigation of it in 1930.

Sirena Deep

• Sirena Deep, also located in the Mariana Trench in the western Pacific Ocean, is the world's third-deepest known point, reaching a maximum depth of around 10,065 metres (32,998 ft).
• It is named after the RV Sirena, a scientific research vessel that surveyed the trench in 1960.

Hossack Deep (Puerto Rico Trench)

• This Hossack Deep in the Atlantic Ocean's Puerto Rico Trench is distinct from the one discussed before in the Tonga Trench.
• It is the fourth-deepest known point in the world's seas, reaching a maximum depth of about 8,648 metres (28,373 feet).

Brownson Deep

• Brownson Deep, located in the Izu-Ogasawara Trench of the western Pacific Ocean, is the world's fifth-deepest known point, reaching a maximum depth of around 8,380 metres (27,493 feet).
• It was named after the USS Brownson, which surveyed the trench in 1963.

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