It would get prohibitively difficult. You need to be deep enough that scavengers and cadaver dogs can’t detect the body, and natural erosion doesn’t uncover it. To do that you need a 5-6 foot hole, to get 4-5 feet of dirt on the body. 2 bodies in the same hole means 7-8 feet deep, which is hard to get out of and can collapse on you.
A decomposing body will also naturally cause a depression in the ground as it decomposes, two bodies would make a more pronounced depression. You can mound the dirt to counter this, but that makes it more noticeable as well.
Protip: you want to dig the hole ahead of time. Otherwise someone might stumble upon you with a body, and then you have to dig two holes.
At that point wouldn’t it be more efficient just to dig one slightly larger hole?
It would get prohibitively difficult. You need to be deep enough that scavengers and cadaver dogs can’t detect the body, and natural erosion doesn’t uncover it. To do that you need a 5-6 foot hole, to get 4-5 feet of dirt on the body. 2 bodies in the same hole means 7-8 feet deep, which is hard to get out of and can collapse on you.
A decomposing body will also naturally cause a depression in the ground as it decomposes, two bodies would make a more pronounced depression. You can mound the dirt to counter this, but that makes it more noticeable as well.