GTA 5 Casino Heist: Sewer Tunnel Location Guide 2026

Master the where is the sewer tunnel in GTA 5 casino heist with this precise 2026 location guide. In the Diamond Casino Heist, the sewer tunnel is a critical access point for the Silent & Sneaky approach, helping you bypass security effortlessly.

Updated for GTA Online 2026 players, this list breaks down exact coordinates, entry methods, and pro tips to locate and use the sewer tunnel without detection. Perfect for solo or crew heists.

Sewer Tunnel #1: East Side Entry

Primary sewer tunnel on the east side of the casino, ideal for quick access.
  • Location: Behind the casino, near the drainage grate
  • Map marker: Yellow icon in planning board
  • Pro tip: Use grapple to enter silently

Sewer Tunnel #2: North Drainage Point

Northern tunnel offers a stealthy alternate route with fewer guards.
  • Coords: Northeast corner, under bridge
  • Approach: Swim from river or drive up
  • Avoid: Patrol helicopter overhead

Sewer Tunnel #3: West Underground Access

Western sewer connects to main vault path underground.
  • Entry: West wall grate by parking lot
  • Navigation: Follow pipes left to junction
  • Elite challenge: No detection timer

Sewer Tunnel #4: South Exit Route

Best for escape, links directly to getaway vehicles.
  • Position: South fence line sewer cover
  • Exit strat: Emerge near NOOSE vans
  • 2026 update: New ladder added

Sewer Tunnel #5: Hidden Backup Tunnel

Rarely used but crucial for retries.
  • Spot: Basement level via staff door
  • Path: Curves to security room
  • Tip: Engineer hack required

All Sewer Tunnels Map Overview

Visualize every sewer tunnel location.
  • Total: 5 main tunnels
  • Planning board unlocks all after scope-out
  • Combine with drone for full recon

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