Ron Popiel is the "Ron" in Ronco.
When diving at the Alhambra site, I don't dig. I find what is on the top of the sand and clay. Want to ruin what little viz you do have? Dig in clay. OTOH, there are sites in the Venice area with nice sandy bottoms. I use a screen box and a small garden shovel in those areas. These things don't look especially practical. Garden tools are better designed.
When diving at the Alhambra site, I don't dig. I find what is on the top of the sand and clay. Want to ruin what little viz you do have? Dig in clay. OTOH, there are sites in the Venice area with nice sandy bottoms. I use a screen box and a small garden shovel in those areas. These things don't look especially practical. Garden tools are better designed.