english: It's absolutely pitch black, because photons cannot reach the average depth of the ocean, which is 12,000 feet. In the Rift Valley, it's 9,000 feet.
non_english: Zifiri karanlık çünkü güneş ışınları okyanusun ortalama derinliği olan 12.000 feet'e ulaşamaz. Rift Vadisi'nin derinliği 9.000 feet.