Royal Caribbean Completes 12 Weeks of Biofuel Bunker Testing 21 September 2023 The firm has been testing biofuel blends on the cruise ships Symphony of the Seas and Celebrity Apex.Author: Capt. Johnhttps://shipandbunker.com/news/world/910602-royal-caribbean-completes-12-weeks-of-biofuel-bunker-testing