After the coach taught them the simplest methods. Next, the teacher instructs them in simple hand movements, because underwater cannot talk, and can only rely on hand and foot language to communicate, upright hand means stop, two fingers swinging the wave up and down means swimming, and holding the nose to breathe means the pressure is increasing, need to go up, finally, it's simpler to use your hands to do Ok.

After the canoe took them out to sea, arrived at the diving site, and stopped, the coach helped Ella to put on a diving suit, put on frog shoes, and an oxygen tank on her back, David has the...