Who We Are

Abyss is a construction company specializing in a multitude of services within the civil works, mining, infrastructure, commercial, and industrial domains. Dedicated to delivering world-class construction solutions across the country, Abyss believes in the importance of quality construction works. With a focus on excellence, innovation, security and intelligent engineering, we aim to make a difference in the construction world. 

At Abyss, we strive to not only provide top-notch construction services but also to simplify the experience. Building trust with our clients is of paramount importance to us. This focus is seen in a large number of returning clients in our customer base. With a reputation for handling complex construction projects with ease, Abyss has embraced the excellence initiative with both arms.

With a dedicated and experienced team, fully-equipped infrastructure, top-grade machinery, and an appetite for quality work, Abyss is your perfect construction partner.

Our Vision

To anticipate our clients’ requirements and deliver exceptional construction services. We aim to become an integral part of our customers’ success.

Our Mission

We deliver construction projects of the highest quality via safe, professional and timely methods while maintaining a strong people-centric approach. 

Our Core Values

Our core values reflect a focus on quality, people, and customer satisfaction. We put people first and value a success culture. Where our people succeed, we succeed.

Meet Our Founders

Abyss Construction is the brain-child of three industry veterans – Tim O’Conner, Patrick O’Sullivan, and Cathal Braonian. With 50 years of experience amongst them, they started Abyss to improve the way the construction business works. They discovered a major gap in the construction sector in terms of reliable, efficient and high-quality work.

Abyss was formed as a solution to address this gap together. Founded in the year 2016, Abyss has grown into one of the most reliable and efficient construction companies in the area.




Cathal is an experienced supervisor with over 17 years of industry experience. He brings a wealth of knowledge and skills into Abyss with his commitment to quality, timeliness, and maintaining an injury-free environment. His recent move to Sydney came after an 8-year long stint with one of the leading structural contractors in the country. 

Some of Cathal’s notable projects as a senior supervisor include:

  • Ichthys LNG Plant in Darwin
  • Barrow Island LNG
  • Woodside’s Pluto LNG Project 



With more than 20 years of experience in construction, Tim is a powerhouse of knowledge about the construction business. He has strong managerial skills with attention to efficiency and focuses on people management. He has influenced Abyss to deliver positive and productive outcomes every single time by building a cohesive team. 

Some of his notable work experiences include:

  • Electrical switchyards across NW Western Australia
  • 7-mile gas turbines
  • Curtin University building 410
  • Yandi – JSE iron ore processing plant – full civil package
  • Pebble crusher stabilization
  • Desalination plant
  • Sino iron



Patrick has successfully handled numerous high-profile roles in major construction, oil and gas, and commodity companies. Before co-founding Abyss, Patrick handled people management for teams of up to 150 personnel, leading multiple projects to successful completion. With certificates in carpentry and construction management, high-risk licenses, construction tickets, and industry training, Patrick is a strong asset to Abyss. 

He brings a can-do attitude and a passion for problem-solving that makes Patrick an important part of Abyss’ dedication culture. 

Health, Safety And ISO Certifications

Abyss Construction understands the construction industry well and delivers on every commitment we make. Our success is defined by our talented workforce and an experienced leadership team. We work towards our goals with a backing of strong work ethics and an innovation culture. Reach out to us today and begin your construction journey with the right partner.


  • Abyss has the following ISO certifications under its belt:
  • ISO 14001:2015 in Environmental
  • Integrated – 45001:2018/14001:2015/9001:2015 in Safety, Quality, and
  • Environmental services
  • ISO 9001:2015 in Quality Management Systems
    AS/ANZ 45001:2018 in Occupational Health and Safety Management Systems