He's 5 months old and never been out before but mil in her wisdom decided to open the kitchen window and he climbed out. We live next to a field/ditch and we heard him meowing outside so we went out with his food bowl and searched. We kept hearing him and then he stopped. There is a tunnel that the ditch goes into under the main road andinto another ditch going through a business park so we think he's gone into the tunnel. Kids are going to be devastated when they wake up tomorrow. Any ideas on how to find him? He's not got a collar or a microchip, we were going to do that before we let him go outside .