what is a flare for at sharks
The flare is a loot item found in Stranded Deep. Flares can be found stored inside hard cases and lockers contained within shipwrecks. Once acquired, flares can be popped by pressing the 'use' button (default 'LMB'). While they do not appear to give off a lot of light, they can be used to effectively scare away sharks. When activated, they can burn for over a day, before burning out; the player is then able to light it again.