The size of Chrysogorgia agassizi colony on the "Titanic" head was calculat
ed from deepwater photographs making by manned submersibles during ten year
s. The colony height was about 4 cm on the photograph of 1991, about 11 cm
- in 1998, and about 12 cm - in 1999. Thus the average annual growth rate w
as about 1 cm per year in 1991-1999.