Glover et al. (2005) reported that disturbance caused the worms to retract completely into the bone. However, when placed in aquaria, with clean, chilled seawater, they would emerge from the bone and be clearly visible to the naked eye. Over a period of several minutes, the worms would first extend the palps, and then the oviduct (see video here). Any disturbance to the aquarium tank would result in the animals immediately withdrawing into the bone.
No one has provided updates yet.