Found a link to a new sim underdevelopment on
www.france-simulation.com, called "Danger from the Deep". Version 0.3 has been released and can be downloaded from
http://dangerdeep.sourceforge.net/download.fr.html. There is a Linux version as well as a Windows version, download size is approx. 61.3 MB. While I don't think it will be a "threat" to SH3 (let alone the GWX team) soon, it could be worth a look.