Here are the release notes.
Danger from the Deep, an Open Source World War II german uboat simulation, striving for technical and historical accuracy, is now in its 0.3 incarnation. This latest version features a considerable amount of new features as well as tons of bug fixes. Amongst the new features, Dangerdeep now appears in full OpenGL2.0/GLSL1.1 goodness.
All shaders were replaced by GLSL shaders. There are now 4 new uboat types, the type IIA, IIB, IIC, IID, with different skins. A new “Captain’s cabin” screen, a new ship’s log screen. A new Tribal class destroyer, with 5 skins. All models are now ready for in-game transformations. There are now per-pixel reflections. The text and fonts are now correct, with umlauts and special characters displayed correctly. The night sky was improved, the periscope view now has a water splash/blur effect. The ocean shaders were improved, torpedos now have rotating propellers. Almost all models are now set for in-game transformations (rotating turrents, elevating guns, etc…). Hall of fame works now. Code is now multithreaded, a new sound system was added in preparation of a new series of sound effects. Improved torpedo management screen, for specific uboats. Added a preliminary “torpedo-cam”. Distance haze was improved, water now uses geo clipmaps, new water splashes on impact. VBO and FBOs are now used, and much more, as well as tons of bugfixes. For a detailed list of changes, please check the Changelog. Note that you need at least OpenGL 1.5 capable graphics, with OpenGL 2.0 the minimum for the high quality graphics mode.