Military : Vessel was capable of carrying more than 100 tons of cargo . 31-meter - long vessel can submerge to a depth of 9 meters , some say . According to the local authorities , the submarine is 31 meters ( 102 feet ) long and capable of submerging to a depth of 9 meters ( about 30 feet ) making it very difficult to locate . Similar vessel was seized in Mexico in July .
Military : Vessel was capable of carrying more than 100 tons of cargo . 31-meter - long vessel can submerge to a depth of 9 meters , some say . Similar vessel was seized in Mexico in July .