What do whale worms eat? why are whale remains able to support so much life? (site 1)

The whale worms feed on the bones of the whale. The skeleton of the whale consists of huge amount of oil and thus is able to support enormous life. Usually a large whale fish bone is made up of 60% oil which is approximately equal to 6-7 tons of oils. The male whale worms live with in the bodies of the female worms. As many as 50-100 males may reside in one female. These worm species live in dandelion weeds and produce lots of eggs,  grow fast and then disperse fast.

After consuming  whale skeleton,  all the worms at that site will die off. Before dying they release lots of eggs that are transported by the ocean currents and survive until they  find whale bones to colonize

The worms, which lack mouths and digestive systems, use rootlike appendages packed with bacteria to feed on the bones of dead whales on the ocean floor. ... The deep ocean floor was once thought to be a biological wasteland, bereft of the light and nutrients needed to sustain life.

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