This is a 31 mission campaign integrated into the standalone extended gaming and mission development system wolfman-MC2X. wolfman-MC2X is based on the released source code for MechCommander 2.
This is the view on another fortification from a different angle.
These fortifications are build in the center of deep water areas.
Standard mechs can not withstand the pressure under the water and will be destroyed. Special units that withstand the pressure have been observed in the hands of the defenders.