Based on the criteria provided, the story of Marla does not contain strong elements of tragedy or comedy. It is a peaceful and contemplative tale, focusing on the simple joys of life and the vivid imaginings of its protagonist. The narrative emphasizes tranquility and the beauty of daydreaming without delving into deep emotional highs or lows.

Here is the JSON format with the evaluated scores:

```json
{
  "TragedyDegree": 1,
  "ComedyDegree": 2
}
```

Explanation:
- **Tragedy Degree: 1:** The story contains almost no tragic elements or emotional setbacks.
- **Comedy Degree: 2:** There are mild whimsical and heartwarming moments when Marla imagines her underwater adventure, but these are not strong enough to be considered comedic plots or evoke strong emotions of delight.
