Then it was that the captain realised the danger he was in, for the mine-sweeper coming up on the starboard bow was also flying the signal for her to heave to.
Dashing to the wheelhouse door, a few paces away from where he had been standing, the captain shouted to the man at the helm,
"Hard-a-starboard!"
And though the tide was with her, the good ship swung round smartly, only in the very nick of time, for, as she turned, one of the deadly mines was within two feet of her stern, and the wash from her screw and the rapid movement of her rudder as she came round, caused the nearest mine to come into contact with a piece of wreckage, at which there was a terrific roar, and a huge column of water was lifted up and hurled some two hundred feet into the air.
Then followed a more terrible spectacle, for one after another the whole string of mines went off, as though they had been countermined. It was just as if there had been a sub-aqueous earthquake, for a prolonged roar of thunder, earsplitting and nerve-racking, immediately followed, while the sea for hundreds of yards around rose up like a huge waterspout, and for some minutes the whole surface of the water, hitherto placid, broke into tumultuous waves.
The tramp steamer received fifty tons of water upon her decks, but save for a slight starting of the plates in her stern, she was untouched. Nevertheless, she had to keep the pumps constantly in use for the remainder of her voyage.
After circling round the spot for another few minutes to speak with the Commodore of the fleet of mine-sweepers, Dastral turned the hornet's head once again towards the enemy's coast, and the captain of the tramp steamer dipped his pennant and gave a long blast on the siren, as a token of gratitude for the service rendered.
The aviators were well pleased with themselves for the part they had taken in the little adventure, which had not been without its thrills, and a spice of danger.
They were now almost in mid-Channel, and could see both shores. There were the white cliffs of Old Albion behind them, while in front, a little on their left, Cape Grisnez rose out of the water. Below them several liners, transports and colliers, could be seen making either up or down Channel, or for one of the ports on the English or French coasts. Turning round to Fisker, the pilot shouted through the speaking tube:--
"Sorry it wasn't a German submarine, old fellow. There'll be no D.S.O. for us for picking up a string of floating mines."