I'm afraid we haven't yet found the answer to acoustic torpedoes and glider bombs.

Blue Boar - Air-to Surface television-guided glider bomb from the 1950s.

The glider bomb, by a freakish chance had crashed directly into the port torpedo tubes.

After this engagement Glasgow returned to Plymouth in spite of several air raids where glider bombs were used.

Of the high altitude variety, these aerial assaults included the use of radar-controlled glider bombs.

All this from German aircraft which dropped glider bombs in the last hours of the three-day battle.

The glider bombs finally dropped, at 200 yards distance, but more planes had joined the foray to commence a sustained 17 minute battle.

The tiny glider bomb was radio-controlled from the carrier aircraft which released it at high altitude.

However, this glider bomb had never been used in action, although more than 1,000 aircraft were manufactured.

And the Heinkel 111, Turner knew, carried that weapon he dreaded above all others, the glider bomb.