The torch is a loot item in Stranded Deep. It is a large battery-operated light source that can be used to illuminate an area in a certain direction.
As of v0.14, once acquired the torch takes up one inventory slot and must press LMP to use it however in v0.3 when acquired the torch was permanently equipped and R must be pressed in order to activate it. The light it gives is bright, but only illuminates in the direction the player is looking. The torch's range is limited, but not as much as the flare's.
The torch will also work underwater, allowing for the exploration of deeper and darker parts of the ocean or inside enclosed ship compartments. It is also a good tool to use to scare away sharks.
Like other loot items, despite spending a considerable amount of time inside underwater shipwrecks, the torch manages to remain almost completely well-preserved, to the point where it functions without any sort of fault to speak of (e.g. flickering). The torch's battery compartment also seems to be well-sealed, as the battery inside appears to work in good condition.