gave way.

Just inside the door, Mazie stood tense, motionless, her arms
outstretched in terror. Fingers rigid, lips half-parted in a scream, she
stared at the door. In the doorway stood the Russian, a knife gleaming
in his hand. For a second his eyes searched the room. Then they fell on
the body of the Jap huddled on the floor. Rage darkened his face as the
Russian took a step forward.

At that instant there had come a dull sound of metal grating on metal.
The Russian toppled over on his side and the two girls were thrown to
the floor.

The chamber had given a sudden lurch. The next instant it rolled quite
over, piling the two women and the corpse in a heap and sending the door
shut with a bang. The Russian had fallen outside. The craft rolled over,
once, twice, three times and then hung there, with the floor for its
ceiling.

Overcome with fright and misery, Mazie did not stir for a full minute,
then she dragged herself from the gruesome spot where she lay.

She gave one quick glance at the door. It appeared to have been wedged
solidly shut. Then she turned to Cio-Cio-San, who also had arisen.

"What can have happened?" Mazie asked in a voice she could scarcely
believe was her own.

What had happened was this: one of the hooks on the police boat had
caught in an outer railing of the submarine. The giant iron fish was
hooked.

To throw other drags, fastened on longer chains, into the sub; to send
tugs and police boats snorting backward; to tighten the chains and draw
the sub to the surface, to whirl it about until the hatchway was once
more at the upper side, this was merely a matter of time.

When the Radicals saw what had been done, they doubtless realized that
if they refused to come out the lid would be blown off and they would
be likely to perish in the explosion. They had apparently planned to
charge the police and attempt an escape, for the Russian came first with
a rush, a pistol in each hand. But Johnny Thompson's good right arm
spoiled all this. He had leaped to the surface of the sub and when the
Russian appeared he gave him a blow under the chin that lifted him off
his feet and sent him plunging into the river.

Seeing this the other members of the gang surrendered.

Johnny was the first man below. Seeing the closed door to the right, he
hammered on it, shouting:

"C'mon out, we're the police."

Slowly the door opened. There before him stood Mazie.

"Mazie!" Johnny's eyes bulged with aston