Just to make it clear (you don’t have to post the next bit, @Harry – and it would possibly (even probably) be advised that you don’t!), is ITA2 (International Telegraph Alphabet No. 2) involved in the decryption/encryption process of Part B of Mission Coda?
[Happy to publish this at this stage of the proceedings! The answer is that a telegraph alphabet is involved in the process but not ITA2. Harry]