Daimajuu Gekitou: Hagane no Oni

It starts off in a familiar sort of way.

Mankind has got it's collective act together enough to build a high energy physics lab.

And, barring the collective howls from anyone who'd want to work on it, have built it on a featureless island in the middle of some ocean.

This lab procedes to discover a new sub-atomic energy source which, being humans, we turn into an energy beam weapon and mount on a satellite.

We also test it on a spare aircraft carrier.

And while the weapon is more successful it also causes a strange black vortex to occur, from which emerges a huge and strange statue.

An on-site mini-submarine crew, against their own wishes for self preservation, are ordered to grab a sample.