The 4900 to ship, with home port Shanghai, is the mthership for Rainbow fish”, a manned submersible which can dive 11,000 m deep. Test dives have been done at 8,000 m in the Solomon sea near Papua New Guinea and are planned, later this year, at an unmanned dive at 10,000 m in the Mariana trench near Japan.”

CAS news release, September 26, 2016