What was the flight crews experience of this route? 
What is known of the crew?

Noel Townsend. Captain, age "27, married and recently a father. He was based in Karachi where he lived with his wife and son.(60)  He had 2,300 flying hours to his credit including 190 as a HP42 commander, and was well thought of as a conscientious and efficient Pilot." (27)  “Shortly before the crash he was removed from Karachi for a time and trained on the AW Ensigns in Croydon. He was due to swap type and was glad not to be flying the HP42s.” (57) He is commemorated on the family grave in Leicester. photo
 
Charles J. Walsh. First Officer. Age 34. Single.  "An ex-Imperial Airways ground engineer, a pilot since 1936 with 1.650 flying hours including 126 on HP42 and considered a careful and conscientious pilot. He was a last minute replacement crew member" (27).
 
Angus H. H. Tidbury. Radio Officer. Age25. Married (27) He had previously sailed with Ellerman Wilson Line in maritme service. (62)
 
Charles. A.F. Steventon. Steward. Age 28. Single. (A last minute replacement(27) in place of 'Robbie' Robinson) (12) Charles had requested assignment to the flight in order to meet a friend in Alexandria. A certificate recognizing his service was delivered to his parents ten years after the loss of the flight. (54)

 

What is known of the passengers?
Harold Whistler was returning to UK to take up a new RAF appointment.
A Group Captain with a distinguished flying career with DSO, DFC with 2 bars, Harold had been serving as Chief of Staff India with the acting rank of Air Commodore.
 Harold Whistler's name features on a war memorial in Singapore and there is a tablet with the Whistler family crest in a church at Frinton on Sea (Essex) dedicated to Harold and his mother.(26) The Singapore memorial commemorates airmen who died during operations over the whole of southern and eastern Asia. His wife was given just the basic information on the incident as it was during a busy wartime period and there was possibly not the opportunity or motivation for comprehensive reporting. They were given to understand that the loss of the aircraft was probably due to bad weather.(26)
 
Henry Hutchison. Warrant Officer 1st class, Conductor, Royal Indian Ordnance Corps. Conductors worked in the Ordnance, Commissariat and Public Works Departments. His passage to London was booked "by the CO of the British Military Hospital in Karachi, an unusual booking for that time" (27) As a serving member of the forces with no known grave he has a memorial on Panel 26 Column 1 of the Brookwood Memorial, his nationality is listed as Indian (?), age unknown. That he was carrying important documents has not been confirmed.(13a)
 
Alf Bryn.  A Norwegian Maritime Captain. Age 43, from Oslo, Norway. (50)  He is listed in the official accident report as working for The Standard-Vacuum Oil Company.(13a) He was variously reported as an American(34) oil man working for Caltex Ltd.(40)  Travel documents filed in the US state that he worked for The Texas Co. (Texaco). He and his wife lived in the Caribbean until 1932,  Shanghai in 1936, (58) and India in 1939. Alf was on his way to take up a post as Port Captain, part of developing Arabian oil production. His flight had been booked from Bombay (63) where he lived wife. Legal action was brought against Imperial Airways/B.O.A.C.  by his family as a result of the accident.  The legal case was frustrated by the refusal of British authorities to assist, deferring all requests to India (13a), and the invasion of neutral Norway by the Nazis on April 9 1940.  (An elder brother had been a senior official in the Norwegian government.). photo
 
M.R. Ry. Rao Bahadur Sir Arogyaswami Thamaraiselvam Pannirselvam Avargal. (32) Was accorded the Indian title of Rao Bahadur ("Advice Lord") with his knight hood (OBI) cr. 1 Jan 1938. A barrister-at -law, he was a member of the Executive Council of the Governor and Ministry of Madras. Was travelling to Britain to take up an advisory position on the War Cabinet, under Lord Zetland the Secretary of State for India.(27) "A Roman Catholic, he was the first Indian Christian to be called to Whitehall for that post. He took part in the Indian round-table conference in London in 1930." (30)  His children, some still very young were orphaned by the loss of their father who was already a widower.(61)(63photo
 

 

Were there more than four passengers?

The official report suggests that at an early stage of the search that six passengers were booked to fly on Hannibal.  "As far as their (Imperial Airways) advance booking indicated there were six passengers on the plane".  "Steps had been taken to obtain the names of the other passengers who were all thought to be civilians."  (13a, Minute 5aOther sources suggest that there were more than four. The implication,- a Kings messenger was aboard. (6) 

Was Hannibal carrying gold bullion?

In examining the manifest and load sheets that have been made public there seems to be little margin for this commodity onboard.
As part of the usual commerce of the Gulf Region it is known that gold was sent in the air mails between the merchants of India and the Arabian coast. Bars worth  upwards of $1000 have been reported. (56)

The investigation report's manifest and load sheets all indicate that they are copies. Do the originals still exist?

Official cover up? If so which set of timings is genuine?

What does the RAF know?

HP42E's were not impressed to RAF service until 1 April 1940. At which time Imperial Airways and British Airways were merged as British Overseas Airways Corporation. The decision to merge British Airways and Imperial Airways was made in 1938 (35) but final arrangements to launch B.O.A.C. were apparently delayed until 1 April 1940. (34)
  Understanding that those aboard included senior military and political figures may class the flight as within the RAF's operations. Similar RAF special movements required a senior officer to travel with the flight.

Has the aircraft been found and its remains disposed of?

With the passage of time and modern techniques for exploration of deep water using sonar or magnetic anomaly equipment on land this seems quite probable. 
 Continuing research and study suggest that this is very likely.  Period artifacts located in the vicinity of the presumed crash site on land need to be positively dated. Found in a very remote region their provenance is of interest as they may have been recovered from the wreckage before dispersal. Assistance in dating these items is requested.  Particularly of interest is whether one artifact was likely to have been part of the aircraft's cabin services inventory.  View. (No mention of  'Hannibal' or 'Imperial Airways' appears on it.) A campaign of search and artifact removal  is believed to have been conducted among the villages of the region once the wreckage was recovered. This campaign is presumed to have occurred prior to the Royal Geographic Society expedition of 1971/2.   "An officer in the former Trucial Oman Scouts, extensively searched the mountain area  in the 1970's.  All traces of the wreckage had been removed by the local tribesmen, but pieces and materials had shown up in searches of local village houses, and in markets from time to time." (anon.) As part of Operation Intradon in Dec 1970 perhaps? (44)

Why have investigators been warned off under threat of the Official Secrets Act?

What circumstances would put such a catastrophe under the Official Secrets Act 100 year rule?

 R.M.S. Lancastria sunk by German bombers off St Nazaire on 17 June 1940 during evacuation of Northern France with 9000 Civilian and RAF troops on board with the loss of 5000 was subjected to the 100 year provision.  (New York Times) It has been suggested that the early British losses were deliberately kept secret on orders from Churchill himself on the grounds of morale. 
     The loss of 'Hannibal' was classified for a reason, the aircraft and its contents were not found, and so it is unlikely that it will be declassified until it is politically or diplomatically safe to do so.

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Richard Hobby, 2002 - 09. ( This page is a collation of information from various sources, please address any concerns about source and accreditation to page author ) updated22/09/16