Shock Waves1977

Horror Vault's take

When a small group of tourists becomes stranded on a desolate island, they stumble upon a dark secret lurking beneath its surface — and in its waters. A mysterious, reclusive figure played by Peter Cushing haunts the jungle interior, hinting at wartime atrocities that never truly ended. What emerges from the lagoon is unlike any ordinary threat, and the survivors must fight to escape before they become the latest casualties of a war that refused to die.

Content: Violence, Threat To Characters In Water, Mild Peril