A Strange Turban Shell

S1, E5: Homare and Asuka go diving for food. When underwater, human vision blurs, however using a certain technique creates improvised underwater glasses which they use to look for turban shells and oysters, but... The severe conditions begin to take their toll on the girls both mentally and physically. Homare remembers something her father taught her - "When things are tough, when you're sad, have a barbecue."