The massive Soviet cannon that requires a five-second warning before firing

Countries & Cities · Published 12 October 2026 Swipe more like this →

In short: The 2S7 Pion is so powerful that its mere discharge can physically incapacitate nearby soldiers. To prevent such concussive injuries, this 203 mm behemoth is equipped with a specialized audible alarm that sounds a series of short warning tones just before the round is launched.

First identified by NATO in 1975 as the M-1975, the 2S7 Pion is a Soviet self-propelled artillery system designed for immense firepower. This machine employs a unique tracked base featuring parts shared with T-80 and T-72 battle tanks. Its primary armament is an externally mounted 2A44 203 mm gun, a 12-meter barrel weighing approximately 14.6 tonnes. This weapon is capable of firing nuclear ammunition and can reach distances of 37.5 km, which extends to 47.5 km when using rocket-assisted projectiles.

The logistics of the Pion are as heavy as its caliber. While the vehicle itself carries four projectiles for immediate use, the full complement of eight rounds requires an auxiliary vehicle to transport the remaining four. The crew of fourteen is split between the Pion and this support unit. Operating the system requires precision and speed; a trained crew can set up the cannon in about six minutes and dismantle it in five.

Since the dissolution of the Soviet Union in 1991, these units have been distributed across various successor states. The system has seen significant combat use, including the First and Second Chechen Wars, the 2008 Russo-Georgian War, and the 2020 Nagorno-Karabakh war. Upgrades like the 2S7M Malka aim to boost firing speeds from 1.5 to 2.5 rounds per minute by refining fire control, while swapping Ukrainian hardware for Russian pieces from Uraltransmash.

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