Board Thread:Antaeus' Arena: Audience Chamber/@comment-1515612-20160326013139/@comment-28759193-20160811211618

It is however a logical assumption. What makes Annabeth so special that she would know morse code and her siblings won't? In no way do we understand how she learnt it, so we can guess that it is an Athena thing. Even Piper knew. She was like 'Annabeth you know morse code?' And her reply was 'Of course', meaning the cause must have been pretty damn obvious.