It was anchored in a cavernous submarine pen that had a high arched roof.
The submarine pen was at the head of the inlet.
The road runs along the edge of the inlet to the submarine pen.
I suggest that we scout out the submarine pen.
During the tours, the submarine pens of block K3 can be seen.
The German improvements to the water locks that control entry to the submarine pens.
However the majority of bombloads were successful in hitting the submarine pens.
They won't allow them anyplace near the submarine pens.
On one occasion he had been bombing the submarine pens at Pola.
Silence, and no lights from within the makeshift submarine pen.