The accumulation of blood during an epidural or subdural hemorrhage creates debilitating pressure on the brain and

In the space between the dura mater and the arachnoid mater

Explanation:

The Dura and Arachnoid mater are part of the 3 layers of the meninges. During a severe head injury or accident, there may be an accumulation of blood during an epidural or subdural hemorrhage creates debilitating pressure on the brain and the space between the dura mater and the arachnoid mater. This can lead to death if left unattended to.