Hi there! This is my old blog - in 2008, I moved to wordpress, and you can find the original post there.
In the meantime, please be safe! Sandhole collapses happen more frequently than you would think, and the majority of them end in death. There are four easy things you can do to prevent such a tragedy:
1 - When you arrive at the beach, always check nearby for any holes left by others, and fill them in.
2 - Do not dig holes any deeper than knee-high of the shortest person in your group. Yeah, I know this sounds extreme. If this feels more extreme than your group can accommodate, then perhaps you can at least stop at waist-high.
3 - If you do dig holes, fill them in before you leave. The hole my son fell in had been left by other children.
4 - Make sure any children you go to the beach with know that holes and trenches can be dangerous, and that they should let you know if they see any abandoned holed.