Calcinite

Live Specimen

Like the driving suits of lost mariners these alien stalk the seabed for the unwary. A vicious swipe by the creature's stronger than steel claws can be enough to send the best divers to the bottom.

Swirling around in face mask a gelatinous green form can be seen. No hint of the real creature can be divined from the often lethal encounters we have had with them.

Autopsy

Once the armoured suit is stripped away the Calcinite is revealed to be a huge amorphous blob of protoplasm. No visible brain, limbs or sensory organs exist, a small metallic component resides deep in the liquid body.

Once dead we can only guess at the creature's nature. An inexplicable enigma of our alien enemies.