Dual 1 Ohm is possible, the coil is made of a very heavy gauge (by voice coil standards) wire most likely 18.5-19.5ga. They have programs that tell them how many windings, what gauge, and diameter the wire should be. The 3000 watts rms is bull though. At DB drag doing burps maybe but if you could put 3000 rms all day (you cant get any amp(s) to put that out to one speaker, not even a Memphis D that is linkable) those suckers will fry.
Few Manufactures now have quad 1 ohm coils, thats right 4 coils on a woofer. More power, more SPL, more trophies (if they dont all blow apart)