They exist. Don't ask "why", just accept their unbelievable strangeness and the fact that other surreal creatures (who knows how many!) may inhabit the oceanic depths, of which we have only explored a tiny fraction.

Whatever you do, don't put it in your salad.

Here is a creature from the underwater gates of hell.

The umbrella mouth gulper eel (eurypharynx pelecanoides) can open its "umbrella mouth" to pelican-like proportion, accommodating prey much larger than its size.

This squid sees the world in color. And it makes deep-blue pretty light itself.

Now we come to the section featuring deep sea beauties

The viperfish (chauliodus sloani) is can grow to over half a meter in size

Here is an angler fish - with its stomach in its mouth