Board Thread:General Grimm Discussion/@comment-37854251-20181218142610

When nick finally opens the door to the tunnels below his loft, he takes a brick and drops it. On screen it took about 10 seconds before it hit the ground. Simple calculations would find that tunnel/shaft is 490m deep or 1600 feet and the brick would've been traveling at about 98m/s when it hits the ground. 