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 email address is being protected from spambots. You need JavaScript enabled to view it.