In addition, there is constant three-way radio communication between passengers, diver, and the support boat crew that remains anchored on the surface of the water.
(the support boat crew; remains; anchored; L:on the surface of the water) (the support boat crew; anchored; L:on the surface of the water)
the support boat crew the support boat crew
remains anchored
anchored L:on the surface of the water
L:on the surface of the water