New footage shows NASA astronaut Christina Koch training ahead of her Artemis II mission earlier this year. Astronauts use underwater training because the buoyancy of water creates a near-weightless environment where they neither sink nor float, allowing them to rehearse spacewalks and build muscle memory for handling equipment in space. 🎥 @achintyabairat #nasa #christinakoch #space #artemis

How Naval Mines Work

Underwater Without Cap & Goggles (Single Breathe) 🏊🏻 #swimming #underwater #swimmingpool

Dropped the kids off for a swim today #fyp #foryoupage #army #chinook #aviation

Lo despreciaron y ahora él salva vidas en el terremoto de Venezuela. #documentales #tsunamielperro #terremoto

Captain Pottie Potgieter of the Ehlanzeni Diving Unit explains how police recovered the body of Zenande Chiloane, who went missing after a vehicle plunged into the Crocodile River on June 7.