Tunnel

On a Sheltered Cove

The engineering challenge — meet in the middle — adapted for sheltered cove conditions.

About This Hole

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.

About This Beach

Small, enclosed beaches sheltered by headlands or cliffs. The calm water and shelter from wind means sand stays damp and workable for longer. Often backed by cliffs that provide shade. The intimate scale makes these ideal for family sessions — natural rock walls frame your digging area.

Compatibility

Good match — sheltered covees provide solid conditions for this hole type with a little preparation.

Ratings

Sheltered Cove digging

Tunnel ease

Best Seasons

🌱 Spring ☀️ Summer 🍂 Autumn ❄️ Winter

Safety — Beach: Check cliff stability before sitting near the base. Tides can cut off exits in enclosed coves — know your escape route and always check tide times.

Safety — Digging: Never leave a deep hole unattended. Fill it in before leaving the beach. Keep walls sloped, not vertical.

What You'll Need

spade
hands

Ages: 6 and up (adults on the digging) | Time: 30–60 minutes

How to Dig It — Sheltered Cove Edition

Conditions on this beach: Medium to coarse sand, often mixed with small pebbles near the cliff base. Sheltered from swell but tidal range still applies. The small size of the beach means tides can cut you off — always check times.

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 for Sheltered Cove

Spring

Ideal conditions — damp sand holds the tunnel roof well.

On this beach in spring: Limited space. Sand can be coarser and harder to work with finer tools. Cliffs can drop debris.

Summer

Only attempt in damp sand below the dry surface layer. Dry sand tunnels collapse instantly.

On this beach in summer: Limited space. Sand can be coarser and harder to work with finer tools. Cliffs can drop debris.

Autumn

Wet sand makes this almost too easy. The tunnel stays open longer.

On this beach in autumn: Limited space. Sand can be coarser and harder to work with finer tools. Cliffs can drop debris.

Winter

Cold wet sand tunnels exceptionally well. Gloves recommended.

On this beach in winter: Limited space. Sand can be coarser and harder to work with finer tools. Cliffs can drop debris.