At 5 p.m. (approximately) I came up to periscope depth to have a look round, but quickly dived again as I discovered a trawler, steering on the same course as myself, about a thousand metres astern of me. This was the more disconcerting, as in the short time at my disposal it seemed to me that she was remarkably similar to the craft I had seen in the afternoon, and yet this hardly seemed likely, as I did not think she could have sighted me then.
On diving, I altered course ninety degrees, and proceeded for half an hour at full speed, then altered another ninety degrees, in the same direction as the previous alteration, and diving to thirty metres I proceeded at dead slow. By midnight I had been diving so much that I decided to get a charge on the batteries before dawn; I also wanted to be up at 1 a.m. to make my position report.
I surfaced after a good look round through the right periscope, which, as usual, revealed nothing. I had hardly got on the bridge, when a flash of flame stabbed the night on the starboard beam and a shell moaned just overhead.
I crash-dived at once, but could not get under before the enemy fired a second shot at us, which fortunately missed us. As we dived I ordered the helm hard a starboard, to counteract the expected depth-charge attack. We must have been a hundred and fifty metres from the first charge and a little below it, five others followed in rapid succession, but were further away, and we suffered no damage beyond a couple of broken lights. The situation was now extremely unpleasant. I did not dare venture to the surface, and thus missed my 1 a.m. signal from Headquarters. I wanted a charge badly, and so proceeded at the lowest possible speed. At regular intervals our enemy dropped one depth-charge somewhere astern of us, but these reports always seemed the same distance away.
At dawn I very cautiously came up to periscope depth, and had a look. To my consternation I discovered our relentless pursuer about 1,500 metres away on the port quarter. In some extraordinary manner he had tracked us during the night.
I dived and altered course through ninety degrees to south.
At 9 a.m. a tremendous explosion shook the boat from stem to stern, smashing several lights, and giving her a big inclination up by the bow.
As I was only at twenty metres I feared the boat would break surface, and our enemy was evidently very nearly right over us. I at once ordered hard to dive, and went down to the great depth of ninety-five metres.
A series of shattering explosions somewhere above us showed that we were marked down, and we were only saved from destruction by our great depth, the English charges being set apparently to about thirty metres.
At noon the situation was critical in the extreme. My battery density was down to 1,150, the few lamps that I had burning were glowing with a faint, dull red appearance, which eloquently told of the falling voltage and the dying struggles of the battery.