Metal Salvage (Subnautica)

Metal Salvage is a raw material found on the seabed.

In the Kelp Forest, it is picked up and gathered by Stalkers.

If the player holds one in his hand near a Stalker, it will pick it up from the player's hand, taming the Stalker in the process.

It appears to be most common in the Crash Zone and Kelp Forest biomes, but the player takes a huge risk in visiting these biomes early-game.