Starting with version 2.3.00, HYCOM source code is hosted on GitHub here,

github.com/HYCOM

Legacy versions are still available here,

data.hycom.org/pub/awall/

Please submit all questions to the forum here,

forum.hycom.org

Or via Email here (please read the forum.hycom.org Welcome message and FAQs before posting),

This e-mail address is being protected from spambots. You need JavaScript enabled to view it