Just for the record for anyone who hasn't worked with the metric system, I am almost 6'3" and could easily be buried, were I crouched to excavate, by the collapse of a 1.2 meter deep unit. Moreover, if there were stone in the collapsing soil I could easily be rendered unconscious or dazed, making it impossible for me to struggle free of even this relatively minor collapse. Whiel I do think OSHa can be somewhat draconian, and that they really do need to figure out what archaeologist do (& how we do it), their standards do have merit. cheers - john John Staeck Warner's Rule #1 Anthropology Program Never argue with a wascally Luther College wabbitt! Decorah, IA 52101 319-387-1284 [log in to unmask]