Meanings of slant fins in English

The Nautilus slid downward on its slanting fins, still sinking.

For two days we visited these deep and deserted waters by means of our slanting fins.

Its slanting fins drew it to depths of 2,000 and 3,500 meters.

The Nautilus, driven downward by its propeller and slanting fins, descended to the lowest strata of this sea.

Several times we used our slanting fins, which internal levers could set at an oblique angle to our waterline.

But just then the Nautilus's slanting fins took us to great depths, and I could see nothing of those high coral walls.

However, from lord-knows-what whim, one day it did a diagonal dive by means of its slanting fins, reaching strata located 2,000 meters underwater.