Tunnel
The engineering challenge — meet in the middle
Two people dig from opposite sides of a sand mound and try to connect underground. The moment a hand reaches through from the other side is one of beach digging's great payoffs. Requires firm, damp sand and a mound of at least 60cm high. More engineering than excavation.
Quick Facts
| Best for ages | 6 and up (adults on the digging) |
|---|---|
| Time to build | 30–60 minutes |
| Tools needed | spade, hands |
| Water needed? | No |
When to Dig It
Best Conditions
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How to Dig It
- Build or identify a firm sand mound at least 60cm high.
- Two diggers start on opposite sides at ground level, angling slightly upward.
- Dig slowly and carefully — the roof needs to bear the weight above.
- Keep the tunnel no wider than 20cm to reduce collapse risk.
- As you get deeper, switch to hands rather than spades for control.
- When close, wiggle fingers through and feel for the other side.
- Collapse the tunnel fully before letting children near it.
Variations
For a simpler version, dig from one side only and see how deep you can go before it collapses. For older children, try an L-shaped tunnel around a corner.
Seasonal Tips
Spring
Ideal conditions — damp sand holds the tunnel roof well.
Summer
Only attempt in damp sand below the dry surface layer. Dry sand tunnels collapse instantly.
Autumn
Wet sand makes this almost too easy. The tunnel stays open longer.
Winter
Cold wet sand tunnels exceptionally well. Gloves recommended.
Try This Hole on Every Beach Type
Flat Sandy Beach
Tunnel on a flat sandy beach →
Steep Shingle Beach
Tunnel on a steep shingle beach →
Tidal Flat Beach
Tunnel on a tidal flat beach →
Rock Pool Beach
Tunnel on a rock pool beach →
Shell Beach
Tunnel on a shell beach →
Tropical Coral Sand Beach
Tunnel on a tropical coral sand beach →
Estuary Beach
Tunnel on a estuary beach →
Sheltered Cove
Tunnel on a sheltered cove →