I was on the dive last June when two of the divemasters removed the monument, I think one was shooting video of it. They said they they were going to build a new place closer to the dive shop outside of the park to place the monument. They said maybe some place by where the plane used to be by the international pier. Would seem to be very hard to dive at that location due to traffic.
I haven't been in the water at that location for quite a while, but if memory serves it's between two piers that extend quite a ways out with a float chain between them.