It varies
The surface zone
The region where no light penetrates in an aquatic environment is known as the midnight zone. The mesopelagic zone is an area where small amounts of light penetrate.
The part of the open ocean that receives enough light for floating algae to carry out photosynthesis is called the euphotic zone or photic zone. This is the upper layer of the ocean where sunlight penetrates and supports photosynthetic activities of algae and other marine plants.
There are three light zones in the ocean. 1) Sunlight Zone, also called the Euphotic Zone. The Sunlight Zone gets lots of light. 2) Twilight Zone, also called the Disphotic Zone. The Twilight Zone gets little light. 3) Midnight Zone, also called the Aphotic Zone. The Midnight Zone gets absolutely no light. As the depth increases, the amount of light decreases and the pressure decreases.
blue light penetrates the deepest in water
Plants in the ocean typically grow in the euphotic zone, which is the upper layer where sunlight penetrates and allows for photosynthesis to occur. This zone usually extends to around 200 meters deep, but can vary based on water clarity and other factors.
dolphins live in the pelagic zone (from shore to shore) and the Nerittic Zone (above continental shelf) and the photic zone (200m deep, where light penetrates) the are not found deeper than the photic zone
The zones of the open ocean are called sunlight, twilight, and midnight based on the amount of sunlight that penetrates each zone. The sunlight zone is the upper layer where photosynthesis occurs, receiving ample light. The twilight zone, or mesopelagic layer, receives limited light, creating a dim environment where some light-dependent organisms can thrive. The midnight zone, or bathypelagic layer, is completely dark and devoid of sunlight, resulting in a cold, deep ocean environment where organisms rely on other means for survival.
Oceans consist of 3 Zones, which are classified by the amount of light that passes through. The top two Ocean layers allow for sunlight to penetrate through, however NOT the third & deepest ocean zone. Euphotic Zone or 'Sunlight' Zone - Depth 200 Meters: The top most 200 meters of ocean is called the Euphotic Zone (or called the 'Sunlight' Zone). Sunlight travels easily throughout this Zone of the Ocean and plant-life flourishes in this Zone and is immensely widespread. Dysphotic Zone or 'Twilight' Zone - Depth 200 Meters - 1000 Meters: This layer, immediately beneath the Euphotic Zone/'Sunlight' Zone, between 200 meters and 1000 meters is called the Dysphotic Zone (or more commonly called the 'Twilight' Zone). Sunlight dissipates quickly as the depth increases, and very little light penetrates throughout this zone. Aphotic Zone or 'Midnight' Zone - Depth 1000+ Meters: The Aphotic Zone (sometimes called the 'Midnight' Zone), exists at depths below 1000 meters. No sunlight reaches this zone at all. It is completely absent of light; hence the slang term for it - 'Midnight' Zone.
Red
Red light penetrates water the least, as it is quickly absorbed and scattered in the first few meters. Blue light, on the other hand, penetrates the deepest in water due to its longer wavelength.