They had dug their way under and beyond German trenches when the explosion of a German mine between the lines cut their gallery, leaving them imprisoned in a space eight feet long. This happened at ten in the morning. They determined to dig toward the surface and encouraged each other by singing Breton songs in low tones while they worked. The air became foul and they were almost suffocated. Their candles went out and left them to burrow in absolute darkness. After hours of intense labor the appearance of a glowworm told them that they were near the surface. Then a fissure of the earth opened and admitted a welcome draft of fresh air. The miners pushed out into the clear starlight. Within arm's length they beheld the loophole of a German trench and could hear German voices. The thought seems not to have occurred to them to give themselves up, as they could easily have done. Instead, they drew back and began to dig in another direction, enduring still longer the distress which they had already undergone so long without food or drink. After digging another day they came out in the crater of a mine. The night was again clear and it was impossible for them to show themselves without being shot by one side or the other. So they decided to hold out for another night. They lay inside the crater exposed to shells, bombs, and grenades from both sides, eating roots and drinking rain water. On the third night Mauduit crept near the edge of the crater and got near an advance sentinel, one of those pushed out at night beyond the lines to protect against surprise. Cadoret, exhausted, lost his balance and fell back into the crater. Under the German fire Mauduit went back and helped his companion out. Both crawled along the ground until they fell into the French trenches. Attacks by French aeroplanes upon the German lines were the main features of the day's fighting for November 28, 1915. They damaged the aviation hangars near Muelhausen, in Alsace, and brought down two German machines. The Germans exploded a mine in front of the French works near the Labyrinth, north of Arras, and succeeded in occupying the crater.