The safest way to obtain the fragments is to get in the Seatruck with Depth Module MK1. The Koppa Mining Site is the location and all four fragments for the Prawn Suit in Subnautica: Below Zero ...

The Cyclops depth 1 module can only be crafted at the Cyclops upgrade station on the Cyclops. All the other depth modules (2 and 3 for the Cyclops and Seamoth, and 2 for the Prawn suit) are ...

The Prawn Suit Depth Module MK1 allows you to go to depths of 700 meters. It requires Enameled Glass, three Ruby and Synthetic Fibers.

In Subnautica: Below Zero, once discovered, Rubies can be used to craft quite a few items. In the Modification Station, two Rubies are needed to craft the Seatruck Depth Upgrade MK2.

All Cyclops Fragment Locations in Subnautica The Cyclops is the largest vehicle you can get in the game, capable of diving to the depths of 500 meters.