 SCP-421 is an organism comprised entirely of driftwood. It is hypothesized that SCP-421 possesses a hive intelligence, similar to that observed in social insects. Though typically docile, SCP-421 requires a regular supply of fresh wood to maintain its mass. The role of the shoal appears to be to locate suitable material. SCP-421 has also been recorded assaulting ships, with the shoal typically ramming against a single point below the waterline, until the target capsizes, before stripping the vessel of all wooden components within reach.