On 29th Feb. 1918, submarine "L 2" (Lieut.-Commander Acworth) had a similar experience, which had very little that was amusing about it. Her opponents were the United States' destroyers _Paulding_, _Davis_, and _Trippe_.
"... I lowered periscope and dived to 90 feet. Gun-shots being heard, I proceeded at full speed to 200 feet, at which depth the first heavy depth-charge exploded, and at the same time the after-hydroplanes jammed hard-up. We now took a tremendous inclination by the stern, the tail touching the bottom at 300 feet.
"Four more very heavy explosions shook the boat. Bright flashes were seen in the boat, and she was at an angle of 45°, bow up. We were unable to correct this trim with the forward hydroplanes, so I gave the order to blow Nos. 5 and 6. This order was promptly obeyed, and the boat slowly commenced to rise, but at a tremendous angle. On breaking surface three destroyers opened a hot fire on us at a range of 1000 yards--one shot striking the pressure-hull just abaft the conning-tower. Recognition signals were made, and White Ensign waved, when firing ceased."
The American destroyers had sighted the top of the conning-tower of "L 2" as she "broke surface," diving in the rough swell. The submarine authorities comment on the incident as follows: "In view of the small amount of conning-tower exposed and the distance at which it was sighted, it is submitted that these vessels made a most remarkably efficient attack."