OVERVIEW: A naval influence mine, The PM16 Blocker is a bottom‑laid, non‑contact smart sea mine developed by Finland’s Forcit Defence. It is programmable with multi‑domain sensors and designed for coastal area denial against surface ships and submarines.

DETAILS: PM stands for “pohja­miina” (Finnish for bottom mine) and 16 is its model designation. The PM16 is housed in a fiberglass body, weighs approximately 750 kg, and carries a 600 kg PBX explosive charge (560 kg Foxit plastic‑bonded explosive with FXP R1 booster), equating to over 1000 kg TNT equivalent. It features a programmable influence fuse with magnetic, acoustic, and pressure sensors, optionally augmented by electric potential detection. Deployable to depths of up to 200 m, it can be stored on shore for up to 25 years and remain operational deployed for one year, extendable to two. From 2013 it entered series production for the Finnish Navy, typically deployed from any vessel via SUMICO 20‑ft containers holding 12 mines 

FUNCTION: Once laid, onboard sensors continuously monitor for target signatures. When a vessel matches preset magnetic, acoustic, and pressure criteria, the non‑contact fuse triggers detonation with sufficient power to rupture hulls of large surface ships and submarines.

NOTE:
IOC: 2013 (PM16 Blocker)
Operators: Finland, Estonia 
Platforms: Deployed from any vessel or helicopter able to carry SUMICO container via standard 20‑ft ISO system 

SOURCE: Forcit Defence International: https://forcitdefence.com/product/blocker ; ArmedConflicts.com: Blocker PM16 naval mine ; ArmyRecognition.com: Estonia takes delivery