My theory is that an extremely magnetic meteorite crashed into the devil's triangle (which could have killed the dinosaurs, by making a huge tsunami of superheated water, burning and also drowning them.) Thus dragging down anything near it. The last things that happen,l before they vanish is their compass and electronics going haywire. Magnetic fields are known for distorting electronic performance and messing compass needles up so they point everywhere. Strange cloud behavior could be from the magnetic fields. It is impossible to see what's down there. Not a robotic submarine, or a telescope. Maybe a satellite image..
The government uses the 4th of July fireworks displays to mask the US launching ICBMs at Nazi bases on the dark side of the moon, and uses chemicals in jet trails to make anyone who may have seen the rockets forget they ever saw anything.
Source: it's real, I promise. I read it on the Internet.
Things go haywire and the pilot/captain/driver vanishes. Look at the wiki's documents about it.
Ehh... There're so many theories about it. UFO, magnetic anomalies, goverment conspiracy, hell's gate, coincidence, kraken, Cth... Cht... Caht... Cthulu?, etc. Does someone know what's hiding there?
C'thulhu*