The original shows are being held hostage by a family dispute. They have not been officially released for DVD production. You can find copies on both tape and DVD that folks offer on E-Bay and on Google. While the plots and acting are definitetly cheezy, that's what makes it great.
My favorite epispde has Mike in the Pacific Northwest. He must blow up a large rock that has caused many a shipwreck, proven by the toy ships in the backgroud. The only thing he has that will do the job is liquid nitroglycerine which, of course, they happen to have on hand in a ship in six foot seas. Mike carefully places the bottles of nitro and he lays the detonator cord on the way in with the last bottle, versus on the way out. When he leaves the stack of nitro bottles he encounters an electric eel (remember this is the Pacific Northwest) laying across his detonator cord. Watch the episode to see what happens.
There is another episode where he dives to around 100 feet to save the crew of a sunken ship. He cuts through the wall with an acetyline torch and then has the victims which include a dog breathe the pure oxygen from the torch (remember this is 100 feet). Then he takes a five gallon cookpot, inverts it and fills the pot with oxygen and puts the dog in there and easily carries the pot to the surface with no buoyancy problems.
What a man - definitely get a few episodes anyway to have around for parties and stuff.