How to Block a Harbor

Many types of mines have been placed by those who are opposing the Sandinista regime in Nicaragua, some relatively sophisticated and others seemingly handmade. According to U.S. intelligence officials, the 30 to 40 used under the supervision of the CIA have caused the most damage. They are smooth cylinders up to 10 ft. long and 21 in. wide, filled with 300 Ibs. of C-4 plastic explosive. Weighted by another 300 Ibs. of material, they are transported by a mother ship operating 30 miles offshore, carried closer inland by speedboats and dropped to...

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