Quicksand can suffocate living things. It is a small pit deep enough to fit a person but not submerge them completely. Quicksand slowly sinks people, making it hard to get out. Quicksand can severely slow down any Bullet to a very slow speed and even cause them to go through the ground. Any living things that are not visible when they reach the bottom will suffocate. A deeper variation of Quicksand is the Tar pit.