Just reading over the posts, Im not sure Id call it a scam. Since earlier systems were delivered and customers are happy, it sounds to me like Undersea Breathing Systems is experiencing difficulties meeting their deliveries. Bad business practices, maybe, but not a scam.
Did you have a written contract? Did it include a delivery date?
If I were you, AquaLogic, Id keep pursuing legal action, and stop publicly slamming UBS before they counter-sue for defamation or slander. Would really add insult to injury if they file for bankruptcy (so you legally loose your money) then won a defamation judgment against you, and you had to pay them more.
Oh, and as mentioned earlier, get yourself and all involved listed with the BBB, then register complaints against UBS. Even if the BBB has no teeth, it would be ammunition in the courtroom.
Be careful, theres a fine line between defamation and warning other shops. Just reading your posts here, the whole thing had an airing the dirty laundry feel to it.
But what do I know... I am not a lawyer, nor did I sleep in a Holiday Inn last night.