環礁五號: 屬國際海洋研究站,可於內環礁與礁平台上作業。 Atoll V: The inflatable boat is easy to travel on reef flat and patch reef areas but with slow speed. Can be carried by Atoll VI and travel for short distance.
環礁六號: 屬國際海洋研究站,可於內環礁與礁平台上作業。 Atoll VI: The catamaran is designed especially for travelling in shallow areas in the lagoon, and can also travel to fore reefs.