There are potentially life-threatening risks associated with using SCORKL products and breathing underwater that you need to be aware of and take steps to avoid.
DO NOT use SCORKL products without reading and understanding the risks and the necessary precautions and safe methods of use as provided in the product User Manuals.
Notwithstanding that it is essential that you familiarise yourself with the User Manuals, especially with respect to the Safety warnings, please be aware that you must never hold your breath when using your SCORKL, especially during ascent. You must also never ascend rapidly. Holding your breath during ascent, or ascending rapidly, can lead to pulmonary barotrauma (also called "lung over-expansion" injuries), which can result in serious injury or death.
The safety video and other videos provided in SCORKL SCHOOL are not substitutes for the product User Manuals. They are just complementary visual guides to some of the key User Manual topics.