Here is my attempt on deciphering barnacle morse code.
I used a recording:
https://www.dropbox.com/s/72k9br8e1x...56.02.mp3?dl=0 from this post:
https://forums.frontier.co.uk/showthread.php?t=227901&p=3729810&viewfull=1#post3729810
I cleaned sound a bit and speed it up in audacity. I noticed that while played fast sound like a thunder occurs from time to time, and that I treated as a separator for letters/signs. Between those thunders there were from two to five sounds (horn like). I assumed the high pitch note is a dot(dit) and low pitch note is dash (dah). If someone wants to hear it I placed the processed file I'm working on here (hopefully I've set sharing right

):
https://drive.google.com/open?id=0B6ikaTbNE-0DOUJJTUtvakM3bUE
And translator was:
http://morsecode.scphillips.com/translator.html
That gave me this:
-..- --.- ...-. ..--- -.-- -..- --..- .---. -.- ..-. -...- .... --.-- ..- .-.-. -.-.
-- .-.-. -.- -..-. -..- .--. -.--. ..-.. -.-.- .-. --.-
.--. .-.-- .--. -.-. ..- .-- .-.-. .-.- -..-. ..-- -.-.-
I've put this together with so called prosigns:
XQ<VE>2YXZJKF<BT>HQU<AR>CM<AR>K/XP<KN>F<CT>RQP<AA>PCUW<AR><AA>/U<CT>
and that translates to something like...
XQ (Understood) 2YXZJKF (Pause) HQU (End Of Message)
CM (End Of Message)
K/XP (Transmit) F (Copy This)
RQP (New Line)
PCUW (End Of Message) (New Line)
/U (Copy This)
That "message" doesn't make any sense obviously (maybe I'm doing something wrong

), but was hell of a fun gathering info about morse code though so - time not wasted. xD
The side effect was a little cheat sheet about morse code i made:
https://drive.google.com/folderview?id=0B6ikaTbNE-0DYkExSkpLMGVXMlU&usp=sharing