Hitler didn't kill himself.
Nazis had a bell-like superweapon, die Glocke. Its whereabouts are unknown.
Key to both theories :
https://en.wikipedia.org/wiki/German_submarine_U-530
American reports at the time :
http://www.uboatarchive.net/U-530A/U-530NAReport.htm
For those that aren't aware of this conspiracy, the U-530 carried something sensitive to Argentina. Which is certainly plausible, due to lack of official records. She surrendered two months after Germany, appeared in Buenos Aires region without a ship's log, any crew documents, removed gun deck. The commander testified they left Kiel for Norway in early 1945, were around UK at the time of surrender, and got the command from Donitz to stand down at the nearest port. He dismissed it as enemy tricks. And then they surrender in Argentina, two months later. In between? Well just rowed to Argentina I suppose...
The U-530 has succeeded in her covert operation. The conspiracy part is whether it actually carried Hitler, die Glocke or Nazi treasures. Maybe none, maybe all, but it did carry something.
She was actually reported as seen lurking around coast and unloading, but that's anecdotal evidence. However records keep that rumors around local police report started before the actual surrender in Mar del Plata.