The fourth in the ongoing series of recruiting demos for Enigma: Rising Tide, Tesseraction Games' MMO naval combat game is now available, offering a further opportunity to check out gameplay in a single-player environment. The new demo features an updated version 1.0.41 codebase and two submarine missions played from the USA side. The demo is an 83 MB download, which is mirrored on 3D Gamers and FileShack (registration required).