Date: 201601
Local time of day: 1801-2400
Location: ZZZZ.ARTCC, FO
Weather elements / visibility: Thunderstorm; Turbulence
Light: Night
Aircraft: Widebody; Low Wing; 2 Turbojet Eng
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Cruise
ATC / advisory: Center ZZZZ
Reporter organization: Air Carrier
Reporter function: Flight Attendant (On Duty)
Reporter qualification: Flight Attendant Current
Anomaly: Flight Deck / Cabin / Aircraft Event Illness / Injury; Inflight Event / Encounter Weather / Turbulence
Detector: Person Flight Attendant
When detected: In-flight
Result: Flight Crew Diverted
Contributing factors: Human Factors; Weather
Primary problem: Weather

Narrative: I believe we were flying directly through a storm. That is information that I learned days after the incident.  Also one Flight Attendant had called the cockpit during the meal service.  She asked the captain when would the turbulence smooth out. The Captain replied that he did not have any information.  The Captain also told her; that our aircraft did not have a 'Satcom'. For that reason we could not fly above 28;000 feet.I feel on airplanes flying trans-atlantic; they must be in tip top shape.  Also dispatch must give us flight plans that go around storms and not thru them.InflightXA:00 PM. About 4 hours in-flight we hit a very strange; loud; hard and rough bit of severe turbulence. Very bizarre. It felt like something  huge outside had pounded our aircraft. I was sitting on J/S #5. [Flight Attendant (FA) B] was sitting on J/S #8. [FA C] was standing in front of me. We were flying along smoothly and this came from no where. It was like a bang; a long feeling of the aircraft falling and tilting to the right; then another bang. FA C grabbed on to the galley. FA B and I grabbed onto [her]. When she could; FA C rushed over to 1L J/S. Very few items were out in the galley but all the carts; in their compartments and inserts just jumped and landed back in place. Even the 2R aux table jumped up and back into place. It was frightening.XA:05 PM. The 3 of us; FA B; FA C; myself; looked at each other in amazement and begin to discuss what had happened. Then; came an interphone call. I figured it was the cockpit calling to explain. However; FA B jumped up; yelled FA D and took off to the back. FA C soon followed and I agreed to monitor up front. Suddenly; FA B made a PA requesting medical assistance. I started to secure the galley. It seemed very difficult because it was still bumpy and I was scared. I just didn't know what had happened with our aircraft.  It was also difficult securing the galley because so many items that we needed for the service; came from the mid-galley. There just was not enough space in the B/C galley.  FA B made another P/A; in foreign language and English; telling passengers to sit down. I turned the lights on in B/C; did a walk thru; picked up all service items; answered a few pax's questions; turned the lights off.  I then buckled in to J/S #1; as it was getting bumpy again.FA B ran up to B/C; asked me for the EMK. I got it; she also took it along with Med kit and Defibrillator. She told me that FA D was badly injured; the cart door was deeply embedded into FA D's leg and the insides of her leg were protruding out. I continued securing galley when a Pilot on break came and started asking questions. It got turbulent again and we both strapped in to a J/S.  It smoothed out and the pilot went AFT to get info for me. I was the only F/A up front and could not leave B/C.Soon FA C ran up and told me that FA E was unconscious. I'm thinking 2 F/As? FA C asked if I was ok? and she returned to the back.  The Pilot came back and told me that it was a mess in back. FA B came back and told me that FA F was hurt. That she had hit the ceiling; hit her head; may have a concussion. She said that FA E flew up as well and landed on top of FA F.  She mentioned that FA F may have broken her foot.  Horrible feelings now as I think 3 F/As are injured. FA B gave me a list of directives and she returned to the back. I don't remember what the directions were but I know I accomplished each task.FA C came back asking for oxygen. I got the bottles from behind B/C. She returned to the back with them.  I also got many bottles from the Mid galley area. I went back to Front and kept trying to call the back. But no one would answer. I figured they were all very busy. So I said over the P/A. 'This is FA A; I have more oxygen bottles up front [if] you need them'. At that moment; I realized I was dialing 44.  Damn interphone!! [There is a different number to] call 4L and 4R. Not an AFT button like on other 767 or 44 on777 planes.The Captain made a P/A 'that Flight Attendants are injured and we are turning around and diverting to ZZZZ; and that we should be landing in 1 hour'. I remember feeling relieved but was still wondering why the Captain did not explain what the hell had just happened to us?  The Captain never told us or the passengers what happened. Why?Around XA:10 PM we landed.We were met by Paramedics. 3 Flight Attendants and 4 passengers were taking off; placed in ambulances and taken to Hospital.




Synopsis: A Flight Attendant describes a turbulent flight over the North Atlantic.  A diversion is required and 3 Flight Attendants and 4 passengers are taken off by ambulance.