How did Troy know that the second vessel (AKA the big blue ball) was Tritan's? I didn't see him sneaking up and peeking in a porthole.

Sorry, Titan's. I'm getting my sea names mixed up.

This is the only episode that shows the Aquasprites (the mini subs) in use, although they are mentioned elsewhere.

When they demonstrate getting gold from the seawater, they end up with several largish nuggets of gold. Gold in seawater is so small as to be invisible. What they should have shown was a fine coating of gold silt in the container.

Didn't Titan's chamberlain bring the On/Off mechanism with him in the sub? Why did they have to wait for the outside device to wear out?

I wonder just what happened to that chamberlain once they got back to Titanica?