# Delve Underground

> Delve Underground is an employee-owned heavy civil and tunnel engineering firm that designs, builds, and rehabilitates the underground infrastructure behind transit systems, water and wastewater networks, and energy projects. Founded in 1954 as Jacobs Associates and rebranded from McMillen Jacobs Associates in late 2022, the firm brings roughly 350 specialists across 21-25 offices in the U.S., Canada, Australia, and New Zealand to some of the most technically demanding tunnels, shafts, and deep foundations in North America and Australasia.

- **Founded:** 1954
- **Headquarters:** Seattle, Washington, United States
- **Founders:** Jacobs Associates (original firm) (Founding firm, 1954)
- **Team size:** ~350 team members
- **Products:** Tunnels and Underground Engineering, Trenchless Engineering, Tunnel Inspection and Rehabilitation, Construction Management, Advisory and Engineering Consulting
- **Notable:** 70-plus years of continuous operation since founding as Jacobs Associates in 1954., Delivered marquee underground projects including the Bay Tunnel, San Francisco Central Subway, Auckland's Waterview Connection, and the Ship Canal Water Quality Project., Provided construction engineering and temporary works for Australia's Snowy Mountains Scheme (Tooma-Tumut Tunnel, 1956).

## Products & services

- **Tunnels and Underground Engineering** — Design and engineering of transportation, water, and utility tunnels, deep shafts, and underground stations in difficult ground and high-groundwater conditions.
- **Trenchless Engineering** — Microtunneling, pipe jacking, and other no-dig methods to install and rehabilitate infrastructure without open excavation.
- **Tunnel Inspection and Rehabilitation** — Assessment, condition monitoring, and rehabilitation of existing and aging tunnels and underground assets.
- **Construction Management** — Design-build delivery, temporary works design, and construction management for heavy civil underground projects.
- **Advisory and Engineering Consulting** — Geotechnical, structural, mechanical, electrical, mining, and geological engineering, ground risk assessment, hydraulics/hydrology, and CFD modeling.
- **Construction Claims and Dispute Resolution** — Claims analysis, expert witness services, and dispute resolution for underground and heavy civil construction.

## Achievements

- 70-plus years of continuous operation since founding as Jacobs Associates in 1954.
- Delivered marquee underground projects including the Bay Tunnel, San Francisco Central Subway, Auckland's Waterview Connection, and the Ship Canal Water Quality Project.
- Provided construction engineering and temporary works for Australia's Snowy Mountains Scheme (Tooma-Tumut Tunnel, 1956).
- Grew to ~350 team members across 21-25 offices in four countries.
- Executed a full corporate reorganization and rebrand in 2022 to sharpen strategic focus on underground work.

## Latest updates

- **2022-12** — Shareholder-approved split-off reorganization takes effect December 1, 2022, separating the underground engineering business.
- **2023-01** — McMillen Jacobs Associates publicly rebrands as Delve Underground and announces new principals.
- **2024-01** — Firm marks its 70th year (seven decades) of underground infrastructure work and joins the International Hydropower Association.

## Links

- Website: https://delveunderground.com
- LinkedIn: https://www.linkedin.com/company/delve-underground
- YouTube: https://www.youtube.com/@delve_underground
- Instagram: https://www.instagram.com/delveunderground/
- Facebook: https://www.facebook.com/profile.php?id=100088912930033

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Profile page: https://yespress.io/delve-underground
Published by YesPress — https://yespress.io
Last updated: 2026-07-15