Welcome to UDI!

We are Boston's oldest dive shop, with 50 years of experience in SDI and ERDI training, specializing in Public Safety equipment supply & servicing, and drysuit/wetsuit repair & tailoring! 

Our Team

Learn more about our awesome staff and dive instructors!

Dive Sites

The best places to dive around Massachusetts!


Get certified to dive in open water 

and trained in 

advanced specialties!


Join us for local fun dives, distance trips, and more! 


We've got the gear you need to dive comfortably in warm or cold water, available for rent or purchase! 


We service regulators, BCs, masks, tanks, wetsuits, drysuits, and more!

Public Safty

We keep Fire & Police Dept equipment up to date, do SCBA training and compressor servicing!


Check out the dates for our classes, open water dives, events, and sales!

News & Events

Stay up to date on our community news and events!

Get In Touch
Contact Us!




59 Washington St

Somerville MA 02144

New Hours of Operation 

Mon - Tue & Thu - Sat

10 am - 2 pm

(Closed Wednesday & Sunday)

Email Us!

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59 Washington St.

Somerville, MA 02144

Mon-Tue & Thu- Sat 10am - 3pm