Place the following images in this directory:

- tropical_island.jpg - Beautiful tropical island with clear waters
- coral_reef.jpg - Vibrant coral reef ecosystem
- shipwreck.jpg - Historic underwater shipwreck
- deep_blue.jpg - Deep ocean waters

You can find suitable images from:
- Unsplash.com (free stock photos)
- Pexels.com (free stock photos)
- Pixabay.com (free images)

Search terms:
- "tropical island diving"
- "coral reef underwater"
- "shipwreck diving"
- "deep ocean blue water"

Make sure images are:
- High resolution (at least 1920x1080)
- JPEG format for better compression
- Suitable for mobile display