Lorena Bobbitt, known for cutting of the penis of her husband back in 1993 in the US... This is where the fellow here got his name:
Commonly know as Bobbit Worm, the reason why he got this lovely name is due to the fact that the female worm attacks the male penis and feeds it to her young after mating...
The most common size for the worm is around 1 meter. But they have been reports of some specimens that where is the size range of 3 meters.
The pictures where taken during a night dive in Lembeh Strait and was maybe around 2.5cm wide (could be around 1.5m long). Good advice if you encounter one, don't get your fingers (or any other body part) to close as you might loose it too him.
Some more pictures of the worm;