secret beneath the sea

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Articles

Title
secret beneath the sea 1-the mysterious metal (1963)
secret beneath the sea 2-voyage into danger (1963)
secret beneath the sea 3-sabotage (1963)
secret beneath the sea 4-the x-layer (1963)
secret beneath the sea 5-take-over (1963)
secret beneath the sea 6-the death trap (1963)