For several years MCT has also been developing technology for use in deep water. These designs are being constantly refined thanks to real data and experience from the manufacture, installation and commissioning of the existing machines.

 
The most accessible and therefore the first tidal energy resources to be tapped are in relatively shallow water (around 30m). This is partly because flows tend to be faster in shallower water, and partly because grid connection is easier.  At these depths it makes economic sense to have access to the equipment above the surface for maintenance.

However, the available energy resource at this depth is finite, and MCT's deep water technology is well advanced and has all the same technical advantages of the SeaGen device but can be scaled to be larger and more cost-effective and it can also operate entirely submerged but with the capability of being surfaced for maintenance, repairs or replacement.