As we all know, the tomb was dark and no snakes could be seen. You can't sweep the snake by pressing v, but there is actually another way to know the position of the snake, which is the ability to lock. Many grave robbers know that snakes are usually at intersections or some halls. As soon as you get to the intersection or lobby, you can press the lock button to automatically lock the snake, and then you can solve the snake by throwing torches and shooting arrows.