Project Description

We are Boston's premier diving education center for Rebreather Training Classes and other scuba lessons in Massachusetts and New England!

About The Course:


The Hollis Explorer is a true recreational Rebreather. While this unit isn’t truly made for technical diving, many divers who are interested in rebreather technology for quieter, warmer, longer, photography friendly dives (fewer bubbles), will love the Explorer as an easy to use option at half the price of the “Technical” units. The unit is neither a fully closed circuit rebreather nor a pure semi-closed system, but an intelligent hybrid that utilizes the best of both worlds. Its compact, lightweight and extremely easy to use.The Explorer is unique in using a single gas; Nitrox and is electronically controlled to achieve an optimal balance of PPO2 and dive time. “Plug and Play” absorbent cartridges, easy guided setup with go or no go, optional CO2 tracking, and 2-hour design duration makes this a dream for any recreational diver.

The Explorer diver will benefit from breathing warm gas, have lots of bottom time, and since it does not produce any invasive bubbles, see more sea life than ever before.

Full Course Cost: $749 + Generic Rebreather Training From TDI


Buy a unit for $4999 and receive the training for free!


Rent-to-own an Explorer for $2500 down including FREE TRAINING and $200 per rental. Each $200 rental goes towards your own unit.

Once you've paid you'll have to register with TDI

*Note* This course only runs from May - October
To find out more about the online signup process check out the tabs above. Remember, if you get stumped or if you have questions that aren't answered by the website you can always call (617) 277-2216 or shoot us an email at and we'll do our best to help!

Before Class

Note- All the paperwork you'll need, along with a what to do before class checklist is located at the bottom of this tab.

Pre-class intro and TDI Folder

Before you can start class you'll need to fill out some paperwork. Most of this can be done ahead of time, but some of it will have to be done in the shop. The only piece that MUST be completed at the shop is a folder provided by SSI. You will need to fill this particular folder out in the shop as we keep it for our records. You can do this before class - just remember to show up 30 minutes early if you haven't filled it out yet!


There are a couple of forms that can be done ahead of time. Most important is the medical. Go through the medical now and check to see if you need to answer "YES" to any of the questions. If so no big deal - you'll just need to get a doctors' sign-off before we can let you in the pool. The doctors' note is in the same file as the medical - Just scroll down to the next page. Remember IF you answer "YES" to anything in the medical it is COMPULSORY to get a doctors' note BE

Online Training

After completing the form you will get an email signing you up for online training. The online training needs to be completed BEFORE coming to class. If you don't receive an email within 36 hours call the shop, and we'll make sure to unlock the training for you.




Since this course is semi-private you'll be working directly with the instructor to schedule your class time, pool sessions and dives. The course is typically finished with one Classroom session, one Pool session and two days of diving.


The Classroom portion will be done at the shop, the Pool is held at Boston University's Walter Brown arena and the open water portion will vary depending on weather and the instructor

Private Courses

This course is typically done as a partially private course already. If you're interested in taking this course and don't see it on the schedule please contact Alex, our Tech diving director. He can be reached directly at


If you need to rent an Explorer or any other gear you can do so here.We offer rental gear for anything that you don't yet have or even complete packages that can be Nitrox ready. If you need any gear besides that listed below check out the rentals page

Searching Availability...


  • 16 Years or older
  • Must be a certified Nitrox Diver.

What's Included:

  • 3 hours of Decompression History & Theory training.
  • 1 Pool Session with the Explorer Rebreather. (Mandatory for divers with less than 25 logged dives)
  • 2 Days of Diving the Explorer Rebreather. (Total of 4 dives)
  • Internationally trained / certified instructor.

Buy It Here!