Is MMRDA planning to realign this tunnel, and why?

Yes, reportedly. Following strong objections from Marine Drive residents concerned about heritage building safety and construction disruption, MMRDA is considering alternative alignments including routes near the Oval Maidan and outside the NCPA.

When is the project expected to be completed?

MMRDA's target completion date is December 2028, with the southbound tunnel expected to reach Marine Drive by December 2027.

Does this project require land acquisition on the surface?

Largely no, since the tunnel runs underground, but the two portal areas at Orange Gate and near Marine Drive/Churchgate involve surface-level construction and alignment decisions that remain under active review.

Has there been a legal dispute over building heights in the Marine Drive Precinct before?

Yes. Residents previously filed a Public Interest Litigation in the Bombay High Court challenging a BMC proposal to double building heights in the precinct, citing heritage preservation and Mumbai's UNESCO nomination bid.

What is the project's cost and who is constructing it?

Estimated at approximately Rs 8,056 crore (with some reports citing Rs 7,765 crore or Rs 77.56 billion), the project is being executed by MMRDA with contractors including Larsen & Toubro's Heavy Civil Infrastructure business.

How will this tunnel improve connectivity to Navi Mumbai International Airport?

By linking the Eastern Freeway to the Coastal Road and Atal Setu via Marine Drive, the tunnel is expected to provide faster east-west access for commuters travelling toward Navi Mumbai International Airport.

Road

Orange Gate- Marine Drive Underground Twin Tunnel

Q: What is the Orange Gate-Marine Drive tunnel and what does it connect?

It is an underground twin-tunnel road project connecting the Eastern Freeway at Orange Gate to Marine Drive near Churchgate, designed to cut travel time between the two points to around five minutes.

Q: How many buildings and heritage structures does the tunnel pass beneath?

The alignment runs beneath nearly 700 buildings, including over a hundred heritage structures, at depths ranging from 12 to 52 metres.

Overview

Orange Gate Marine Drive Tunnel Mumbai refers to MMRDA's underground twin-tunnel road project connecting the Eastern Freeway at Orange Gate to Marine Drive near Churchgate, running beneath South Mumbai's island city at depths of up to 52 metres. Orange Gate-Marine Drive Underground Twin Tunnel is a live on 1acre. Approved at a cost of roughly Rs 8,056 crore, with tunnelling launched by the Chief Minister in December 2025 and a targeted completion of December 2028, the project runs beneath nearly 700 buildings, including over a hundred heritage structures, several railway corridors, and Metro Line 3. This page covers a live realignment debate triggered by heritage-area residents, and what that signals for anyone with property interests near the route.

Marine Drive's Heritage Objections and a Possible Realignment

Within a week of the Chief Minister launching the tunnel boring machine, MMRDA began considering altering the tunnel's alignment following strong objections from Marine Drive residents.

The Marine Drive Citizens Association raised concerns that the original alignment, connecting Orange Gate under the Mumbai Port Authority to D Road near Churchgate adjacent to Wankhede Stadium, would disturb the iconic Art Deco heritage precinct, worsen construction-phase traffic, and cause air pollution.

Residents specifically criticised the original Opera House entry point as impractical, and MMRDA is reportedly considering alternatives including reclaiming land beyond the National Centre for Performing Arts, routing the alignment outside NCPA entirely, or positioning tunnel entry points near Oval Maidan instead.

Marine Drive's Heritage Objections and a Possible Realignment

**Concern Raised**

**What Residents Argued**

**MMRDA's Response**

Heritage building safety

Original alignment risked structural implications not adequately studied

Considering alternative, "safer and less intrusive" locations

Opera House entry point

Termed impractical by residents

To be replaced under a new proposal

Construction-phase disruption

Traffic diversions and air pollution concerns near the heritage stretch

Alternative alignments including NCPA-adjacent options under discussion

**Concern Raised**

**What Residents Argued**

**MMRDA's Response**

Heritage building safety

Original alignment risked structural implications not adequately studied

Considering alternative, "safer and less intrusive" locations

Opera House entry point

Termed impractical by residents

To be replaced under a new proposal

Construction-phase disruption

Traffic diversions and air pollution concerns near the heritage stretch

Alternative alignments including NCPA-adjacent options under discussion

This is not the Marine Drive Precinct's first fight over development near its heritage buildings. Residents previously took the BMC and Maharashtra's Urban Development Department to the Bombay High Court over a proposal to double building heights in the precinct, arguing it would destroy the value and integrity of the area's Art Deco heritage and jeopardise Mumbai's UNESCO World Heritage nomination bid. That litigation forced the civic body to hold off enforcing its guidelines pending a Supreme Court decision on a related petition. Given this precedent, any property owner near the tunnel's southern portal should expect the exact alignment and entry-point location to remain subject to change, and should track MMRDA's finalised route rather than the originally announced one.

What This Means for Property Near the Tunnel Route

The tunnel itself runs almost entirely underground and requires no large-scale surface land acquisition of the kind seen on typical highway projects, but its two portals, at Orange Gate and near Marine Drive/Churchgate, are exactly where surface-level property impact concentrates.

What This Means for Property Near the Tunnel Route

**Location**

**Relevance**

**Known Risk**

Orange Gate (Eastern Freeway terminus)

Northern tunnel portal, connects to existing elevated freeway

Established infrastructure node; limited fresh land acquisition needed

Marine Drive / Churchgate / D Road

Southern portal area, adjacent to Wankhede Stadium and NCPA

Alignment and exact entry point still under review following resident objections

Marine Drive Art Deco precinct

Heritage-protected zone directly above/adjacent to the tunnel route

Any redevelopment here has a documented history of litigation over height and heritage rules

CSMT and railway corridor crossing

Tunnel passes beneath Chhatrapati Shivaji Maharaj Terminus at depth

Engineering constraint, not a direct property-transaction concern for most buyers

**Location**

**Relevance**

**Known Risk**

Orange Gate (Eastern Freeway terminus)

Northern tunnel portal, connects to existing elevated freeway

Established infrastructure node; limited fresh land acquisition needed

Marine Drive / Churchgate / D Road

Southern portal area, adjacent to Wankhede Stadium and NCPA

Alignment and exact entry point still under review following resident objections

Marine Drive Art Deco precinct

Heritage-protected zone directly above/adjacent to the tunnel route

Any redevelopment here has a documented history of litigation over height and heritage rules

CSMT and railway corridor crossing

Tunnel passes beneath Chhatrapati Shivaji Maharaj Terminus at depth

Engineering constraint, not a direct property-transaction concern for most buyers

Once complete, the tunnel is expected to cut travel time between Orange Gate and Marine Drive to around five minutes, and to improve connectivity toward the Navi Mumbai International Airport by linking with the Coastal Road and Atal Setu. For anyone with property interests in the Marine Drive Precinct specifically, the relevant question is not whether the tunnel will boost value, but whether the still-unsettled southern alignment will run directly beneath or immediately adjacent to a specific building, and whether that building falls within the heritage-protected zone that has already generated one Bombay High Court dispute over redevelopment rights.