The depth of "the 9" is ambiguous in the query. However, a highly relevant interpretation is the depth of the "Challenger Deep," the deepest known point in the ocean, located in the Mariana Trench, which is sometimes referred to by the number 9 in shorthand for "deep" or "9" in oceanic contexts. The Challenger Deep has been measured with depths around 10,920 to 10,935 meters (approximately 35,827 to 35,876 feet). According to the latest precise measurements, it is about 10,935 ± 6 meters deep, which is roughly 36,000 feet below sea level. This is the deepest natural point on Earth’s seabed.
If the query refers to something else, please specify further, but this is the most relevant deep measurement connected to "9" as in "depth of 9" or similar.
