I have entered the symbol SEFE in my pretend list of investments, along with others that were touted by full-color flyers heavy on the hype and light on the facts. Years ago, I had some shares in a oil and gas drilling limited partnership with Kelley Oil, which resulted in perhaps a 12% annual gain. Kelley went broke and was bought by Anadarko, and I think they sold the mailing list, because that was when I started getting these promo flyers.
There may or may not be something useful in SEFE's plan, but as you say, balloons get hit by lightning and a major zapping would probably bring the whole thing down. If you fill the blimps with Hydrogen, then there is the explosion problem. And besides that, there is the danger of aircraft straying into the area, or balloons and lines coming loose and running into aircraft.
For the moment, this seems to be a classic "Pump and dump" farce. I will not be investing, since to make money I would have to know when to dump.