The sea was blue; the implacable ultramarine blue of unfathomable depths.

His blue eyes were unfathomable depths, making her feel uneasy.

It is a land of unfathomable depth, where what you see above the surface is mirrored below.

These are works of unfathomable depth and complexity.

Color is equally disliked and distrusted for its unfathomable, undefinable depths.

The human peered into the unfathomable depths of the Ssana's personal darkness.

The enlarged pupils of the woman received his stare into their unfathomable depths.

If not an oncoming serpent, perhaps a sheer drop-off to some unfathomable depth.

Then she spoke, and though the words were few, the unimpassioned tone carried unfathomable depths of cold contempt.

One certainty emerging from my father's unfathomable depths is that such hugs are not easily forthcoming.