The Flash (2014)

'The Flash' is an ongoing superhero drama series airing on The CW, a spin-off of 'Arrow' and the second series in The CW'S shared universe known as the Arrowverse. Based on the DC Comics character of the same name, the series follows Barry Allen, a crime-scene investigator who gains super speed after being struck by lightning and becomes crime-fighter The Flash, using his powers to save Central City.

S4E2: Mixed Signals
With his suit fitted with new gadgets and upgrades, Barry accidentally sets off flotation mode, meant to be used in case he's in water (Cisco, his friend and inventor, not thinking he could just include an oxygen tank if he loses speed while on water).