On the labour point.. it still doesn't make sense to me. Sure, they had very poor oh&s but they also used shovels to dig and baskets to remove fill. It just doe

On the labour point.. it still doesn't make sense to me. Sure, they had very poor oh&s but they also used shovels to dig and baskets to remove fill. It just doesn't seem like the extra cost of safe work practices could possibly offset the productive bump from machinery.