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7 sets

Hydro Crystallization Station

6199-1

Hydro Crystallization Station

Hydronauts 1998

Hydro Search Sub

6180-1

Hydro Search Sub

Hydronauts 1998

Crystal Detector

6150-1

Crystal Detector

Hydronauts 1998

Crystal Detector

6159-1

Crystal Detector

Hydronauts 1998

Solo Sub

6110-1

Solo Sub

Hydronauts 1998

Super Sub

1095-1

Super Sub

Hydronauts 1999

Aqua Dart

6100-1

Aqua Dart

Hydronauts 1998

That's all 7 sets