unable to give any information as to how many are imprisoned. Their responses to the dots and dashes rapped out on the outside of the sunken craft have been a series of un­intelligible knocks.
     For a second time, Shep snaked a guideline through the trench. Another four-inch cable was pulled through. Ajax lifted. The cable broke again.
     Shep went under the submarine a third time. The cable broke a third time.
     Shep had been diving for almost twenty-four hours. Navy doctors worried that he would collapse from exhaustion or that his heart would fail under the strain.         
     Shep tried once more. Two things held the submarine down: one was simply the weight of the flooded craft; the other, the suction of bot­tom mud wrapped around the hull. To reduce the sub's weight, Shep aimed a jet of compressed air into the engine room. As water and mud boiled to the surface, Ajax began to pull gently for the fourth time.
     Shep sensed the moment was right. He signaled Ajax to begin lifting in earnest. The bow of the 0-5 began to rise. From 12:30 to 1:10 P.M., Ajax pulled. Then the sub's bow broke surface.
     Two survivors crawled out after thirty-one hours of imprisonment: Chief Electrician's Mate Lawrence Brown and Torpedo man Second Class Henry Breault.
     Shep Shreaves demonstrated exceptional skill and courage. Panama Canal employees have pointed with pride to similar excellence among many fellow workers. Foremost recognition has been given to the pilots who board ships, take command, and move them safely through the canal.