1. Episode 1

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. 1 December 1970. 30 min

Three boys are investigating a ruins of the old fortress during summer vacations.

2. Episode 2

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. 18 December 1970. 30 min

Three boys are investigating a ruins of the old fortress during summer vacations.

3. Episode 3

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. 3 January 1971. 30 min

Three boys are investigating a ruins of the old fortress during summer vacations.

4. Episode 4

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. 18 January 1971. 30 min

Three boys are investigating a ruins of the old fortress during summer vacations.

5. Episode 5

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. 4 February 1971. 30 min

Three boys are investigating a ruins of the old fortress during summer vacations.

6. Episode 6

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. 28 February 1971. 30 min

Three boys are investigating a ruins of the old fortress during summer vacations.

7. Episode 7

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. 18 March 1971. 30 min

Three boys are investigating a ruins of the old fortress during summer vacations.