rough cement wall in the sewage pipe 
This is a hole
This is a tunnel
a person on a skateboard
a boy on a skateboard
a young man on a skateboard
a person skateboarding in a culvert
a boy skateboarding in a culvert
a young man skateboarding in a culvert
the inside of a culvert
a boy skateboarding in a circular culvert
Man that is skateboarding.
Tunnel with a skateboarder.
Opening to the tunnel with skate boarder.
a man riding a skateboard down the side of a tunnel