The PDM amphibious mines were a series of Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

n anti-vehicle mines

Anti-tank mine

An anti-tank mine, , is a type of land mine designed to damage or destroy vehicles including tanks and armored fighting vehicles....

 that could be used on or in beaches, rivers, lakes and shallow coastal waters up to five meters deep.

PDM-1

The PDM-1 has a hemispherical steel case, which is anchored to a heavy steel base. It is normally deployed in water one or two meters deep, and has a central fixing point for a tilt rod. Two men can lay a single mine in 10 to 20 minutes. The mine uses a VPDM-1M tilt rod fuse with an MD-10 detonator.

PDM-1M

The PDM-1M is almost identical to the PDM-1 only having a booster charge to ensure detonation.

Bulgarian PDM-1M

A Bulgaria

Bulgaria

Bulgaria , officially the Republic of Bulgaria , is a parliamentary democracy within a unitary constitutional republic in Southeast Europe. The country borders Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, as well as the Black Sea to the east...

n version of the PDM-1M exists that is substantially developed from the original it uses a plastic cased mine, with a concrete

Concrete

Concrete is a composite construction material, composed of cement and other cementitious materials such as fly ash and slag cement, aggregate , water and chemical admixtures.The word concrete comes from the Latin word...

 base and a programmable fuse. The fuse can either be of the electro-mechanical tilt rod type, or a magnetic influence fuse. All the fuzes incorporate a 15 minute arming delay. The mine can self-neutralize or self-destruct after a programed period of between 1 and 45 days.

The mine can be mechanically laid and recovered, and can operate in 0.8 to 2 meters of water.

PDM-2

The PDM-2 has a spherical case. The mine has a large base plate, which it is fixed to by a pole, and four suspension wires. It uses a VPDM-2 tilt rod fuse, and can be used in water from 2.4 to 3.8 meters deep.

Bulgarian PDM-2M

The PDM-2M is a Bulgarian mine - it uses a similar fuzing system to the Bulgarian PDM-1M, but incorporates a much larger main charge.

PDM-6

The PDM-6 is similar to the PDM-1M, except that it fitted with a secondary fuse well for an anti-handling device on the base, as well as three fuse wells on the top for tilt rod fuzes. The tilt fuzes can be set for contact detonation or to trigger once they reach a certain deflection.

Specifications

Mine	Diameter	Height	Weight	Explosive content	Operating pressure
PDM-1M		1 m	21 kg (mine) + 24 to 29 kg (base)	10 kg of TNT	18 to 26 kg tilt
PDM-1M Bulgarian	0.3 m (approx)	800 mm (with contact fuse Contact fuse A contact fuze, percussion fuze or direct-action fuze is the fuze that is placed in the nose of a bomb or shell so that it will detonate on contact with a hard surface.... ) 450 mm (with magnetic influence fuse)	15 kg (mine) 85 kg (mine and base)	12 kg of TNT	variable or magnetic influence
PDM-2	0.27 m	1.1 or 2.7 m	100 kg or 135 kg	15 kg of TNT or Ammonite Amatol Amatol is a highly explosive material made from a mixture of TNT and ammonium nitrate. Its name originates from the words ammonium and toluene...	40 to 50 kg tilt
PDM-2M Bulgarian	490 mm (warhead) 1.05 m (anchor)		110 kg (overall) 28.5 kg (main charge)	16 kg of TNT	variable or magnetic influence
PDM-6	0.5 m	0.25 m	47.5 kg (mine and base)	28 kg of TNT or PETN PETN Pentaerythritol tetranitrate , also known as PENT, PENTA, TEN, corpent, penthrite , is the nitrate ester of pentaerythritol. Penta refers to the five carbon atoms of the neopentane skeleton.PETN is most well known as an explosive...	variable