그래서 우리가 직면한 다음 문제는 산소를 어떻게 빼낼수 있는가였죠. 그래서 우리는 물을 순환시켜서 산소를 뽑아낸 다음 이산화탄소 거품을 집어넣을 수 있는 통로를 설치했습니다.
So the next thing we had to figure out was how we could remove the oxygen, which we did by building this column which circulated some of the water, and put back CO2, which we did by bubbling the system before we recirculated the water.