Total Mayhem takes Total Annihilation, bugfixes and extends it the way Cavedog might have. Early game pace is quicker, many new units added (longtime players may recognise some 3rd-party units), including a whole new 3rd tech level tier. Existing and added units have been bugfixed, rebalanced, re-modeled, re-textured and re-rendered to equal or exceed the standard of the original TA units.
bit overdue on this one really. Sea needs a cheap point-defence, adv tidals could be better value, the original combination of the two as done by M3G years ago didn't make sense from a gameplay perspective in TA, so Adv tidal generators will no longer be armed, and floating LLTs will now be available as standalone units!