Anthony, Texas (KTSM) — The world's largest swimming lesson is happening today. Water safety and training organizations around the country are holding swimming lessons at 9 a.m. mountain time today as part of the annual event. Here in the Borderland, Wet N' Wild in Anthony is participating. The Drowning Prevention Coalition is helping organize the event. Founders Laura and Eddie Castle started the event here after losing their son Christian in a drowning accident six years ago.