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. This can be done multiple times, maybe even indefinitely.
A great use for the flare is to drop it inside the life raft/wooden raft while lit before paddling away with it. By doing this, the player will dramatically decrease their chances of getting attacked by sharks whilst out in the ocean, as the flare's light will frighten them.
- Like other loot items, despite spending a considerable amount of time inside underwater shipwrecks, the flare manages to remain almost completely well-preserved, to the point where it is considered fully usable for an entire day by the time the player discovers one.
- The game model for the flare strongly resembles that of Pains Wessex marine flares used in real life.