General knowledge about Types Naval mines and Minesweepers used during WWI and WWII.

1. MINE SWEEPERS
Kailash Ambekar
NA12B013
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2. What is naval mine ?
 A naval mine is a self-
contained explosive device placed in
water to damage or destroy
surface ships or submarines.
 Unlike depth charges, mines are
deposited and left to wait until they
are triggered by the approach of, or
contact with, an enemy vessel.
 Naval mines can be used
offensively—to hamper enemy
shipping movements or lock vessels
into a harbour; or defensively—to
protect friendly vessels and create
"safe" zones
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3. Classification of Mines
 By method of delivery
• Air –delivered mines
• Surface delivered mines
• Submarine delivered mines
 By position in the water after delivery
• Moored mines
• Bottom mines
• Drifting mines
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4. Classification of Mines
 By method of activation
• Contact Mines ( usually moored ).
• Influence Mines ( usually bottom ).
• Magnetic .
• Acoustic .
• Pressure .
• Combination .
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5. MINESWEEPER5
Fig : Mine planting process Fig :Types of mine delivery
Fig : parts of contact mine

6. MINESWEEPER
• A minesweeper is a small naval warship designed to
engage in minesweeping, the use of various mechanisms
intended to counter the threat posed by naval mines.
Minesweepers keep waterways clear for shipping.
 Types of mines sweepers
• Mechanical sweeper
• Magnetic /acoustic sweeper
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7. History of minesweeper
• Minesweeper are significantly used in WorldWar I.
initially contact mines are used .usually tethered at the
end of a cable just below the surface of water.
• Mechanical sweeps are devices designed to cut the
anchoring cables of moored mines ,and preferably attach
a tag to help the subsequent localization and
neutralization.
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8. • In WW II minesweeper made significant advancement .
magnetic mines led to the development of wooden hull
non-magnetic sweepers to replace steel hulled
• These craft had plywood hulls, stainless –steel- alloy
engines and metal fitting of aluminium ,brass or
magnesium.
 Electrical cables were dragged behind ships that passed
large pulses of current through the seawater called as
“Double-L sweep”.
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9. Fig :Magnetic sweeping cables Fig :Magnetic mine in action due to
magnetic signature of submarine
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10. Mine Countermeasures
 Self –Protection
• Silencing (protection from acoustic mines )
• Degaussing (protection from magnetic mines )
• Steaming slowly ( protecting from pressure mines )
• Clearing/Removing Mines
• Mine sweeping
• cut cable then activate to destroy (moored mines).
• Use acoustic / magnetic noisemakers to activate.
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11. Indian Mine sweepers
 Pondicherry class minesweepers
• Pondicherry class are a class of minesweepers built for the
Indian navy by the soviet union .
INS Pondicherry INS porbander
INS Alleppey INS Ratnagiri
INS Kozhikode INS Kokan
 Mahe’-class minesweepers
INS Malpe INS Mulki
INS Malvan INS Mangrol
 Ham-class minesweepers
INS Bassein HMS Hildersham
INS Bimlipatan HMS Littleham
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12. MINESWEEPER12
Fig : INS Kozhikode ,
Pondicherry –class minesweeper