pyrosomes

A beautiful thing, Pyrosoma atlanticum.
(if that doesn't work for you, it's the Rick Anderson photo on thsi page.)

"Bob Gladden's monster Pyrosoma" appears halfway through this movie.

Also,

What appears to be one long creature is a colony of joined-together individuals, like reef corals except squishy. Each individual in a pyrosome colony has a mouth facing outward.
[...]
The opening of the largest pyrosome is so big a person can swim inside.
[...]
"I wrote my name with my finger on the surface of the giant Pyrosoma as it lay on the deck in a tub at night, and the name came out in a few seconds in letters of fire."
[...]
It has been suggested that the 1964 Gulf of Tonkin torpedo attack on an American ship, which drove the U.S. deep into the Vietnam War, were pyrosome flashes, because the creatures are common in that area.

froot

[Poll #233420]