Ep. 10: Grandis, Sanson, and Hanson attempt to clear mines for the Nautilus escape.
Aired on June 15, 1990

10
The Nautilus is trapped in a minefield within the LeMar Straits while fleeing Gargoyle. Grandis, Sanson, and Hanson volunteer to use the Gratan to destroy three mines. Sanson knocks Grandis unconscious to protect her, leaving him and Hanson to pilot the tank. Jean secretly boards the vehicle to assist them, but the Gratan suffers malfunctions and loses its camera, rendering it blind. Guided by Grandis’s voice from the Nautilus bridge, the trio works together to navigate the hazardous environment. They successfully detonate the remaining mines, allowing the submarine to escape the deadly trap set by their pursuers.
Episodes
- Ep. 6 · Jean and Nadia infiltrate the island's secret factory complex to rescue Marie and King.
- Ep. 7 · Gargoyle forces Nadia to reveal the Blue Water's location while showcasing the destructive Babel tower.
- Ep. 8 · Jean allies with Grandis gang to infiltrate compound and rescue Nadia from Gargoyle's submarine.
- Ep. 9 · Nemo's Secret: The Nautilus Visit and Blue Water Discovery
- Ep. 10 · Grandis, Sanson, and Hanson attempt to clear mines for the Nautilus escape.
- Ep. 11 · New recruits join the Nautilus submarine crew
- Ep. 12 · The Nautilus visits an island where Jean meets Nadia and Grandis competes for Nemo's attention.
- Ep. 13 · Marie is urged to flee in this episode title.
- Ep. 14 · The crew ventures into Reef 64 to find a cure for Marie and Nadia's fatal tropical fever.