results won't be in for more than a year, and bren smith is eager to see them. growing shellfish on his kelp farm, too, but not, he admits, because of the science. he says it's good business. in november, he and his team loaded thousands of baby mussels into netting that looked like massive sausages, then suspended them from ropes that hang down below the kelp. he calls it 3d ocean farming. >> stahl: why 3d? >> smith: we call it that because we're using the entire water column, and if you can stack crops on top of each other, it's just really efficient. you don't use large, you know, plots of ocean. but you get so much food. >> stahl: so you've got your seaweed. >> smith: yup. you've got the kelp here. and then we have the mussels. >> stahl: underwater, each row looks something like this. >> smith: off those same lines, we have scallops. and then below the whole system, we have cages with oysters in them. >> stahl: he brought up one of those oyster cages from the bottom to show us. what kind are these? >> smith: we call these thimble island salts. let's haul som