What is the deepest any amount of sunlight can reach in the ocean?

In 1975, I was at 115 meters under to North Sea in a two-men mini-submarine. It was for the company Intersub of Marseilles, where the Condeep oil production platform Statfjord B was to rest on the seabed.

I was the navigator on board. One day, the pilot told me: "Should we try to switch off the lights? After we did, we could see the contour of the huge porthole we had in front of us. After a few minutes, the contour of the frame of the submarine and its instruments. The light goes this deep but then ... not much of it.

Here is the submarine we used:

It is usually accepted that 200 metres is the extent of how far sunlight can travel below the surface.

At this level everything lives in the dark. Some creatures down there have adapted to life in these low level light and some even produce there own headlamps. These creatures not only have to contend with the lack of light, but also the massive pressures exerted upon their bodies, which perhaps explains there very angular body shapes?

Deep sea fish

Depends on the turbidity of the water. The more particles (algae, sediment or marine snow) there are in the water column, the less far light can penetrate.

So in the coast of the North Sea, light is already very limited at 30 meters deep as there is high turbidity. But in less turbid areas light can reach further than 200m.

Also, it depends on what light you measure. Waves of blue light penetrate way deeper than red light.

Why don't human adults want to drink human milk?

My guess is that humans have a bit of an aversion to it for at least 2 reasons.  One, society has sexualized a woman's breasts to the point where there's probably a psychological reaction to the idea of consuming breast

How many batteries are in a Tesla car?

There are two batteries: one for the driving, consists of thousands of cells (precise amount depends on capacity) and one for standby and switching vehicle on. 12V battery that listens for remotes and wireless connection for smartphone control.

What are the best qualities of the human race?

Feeling of compassion towards our fellow beings.Spread smiles and laugh out loud.Experience different cultures and religions and embrace them all.Invent or discover new and amazing things.Intelligence, a major quality that makes us land on top of any other living being on earth.Ability to take care of not only fellow human beings but