One correct answer. Make it an unexpected one.

1. Six prompts. 20 seconds each.Type one answer, then press Enter or Dive.
2. Uncommon answers take you deeper.Every knowledge point takes you 10 metres. Aim for 6,000m.
3. Take a breath between questions.The next clock starts when you press Descend. A running clock keeps going if you leave.

Scores are fixed editorial ratings. Real crowd counts and answer sources are available after each reveal.