a stupid and wrong take that has has already been disproved here and the rest of the intertron
The nazis were digging in the wrong place with zero success and Hitler was demanding results. There was no guarantee that effort was going to be funded indefinitely. They were absolutely convinced the dig was in the right area; digging a km away in a random direction from their current target would have been idiotic without substantial proof they were in the wrong spot.
My favorite stupid internet take is "but the nazis would have found Marion/the amulet and found the correct location", conveniently forgetting that the Nazis were looking for Abner....they eventually followed Indy...WHO LED THEM DIRECTLY TO MARION....who the nazis didn't know about and were never, ever gonna find in a BFE Himalayan dive bar.
All the meddling Indy did caused Beloq to open the Ark early on the island, causing the Ark to end up in a US warehouse. If the nazis had found the Ark and Indy wasn't around to steal it, it was headed straight for Berlin, where Hitler and the nazi high command were gonna open it, melt half of Berlin and no more nazi party....or WWII. So thanks a lot Indy, you meddling dipshit.