
Processing tanks at a site in Kansas where waste is pumped into an underground salt cavern
Vaulted Deep
A groundbreaking initiative by Vaulted Deep, a start-up, has caught the attention of tech giant Microsoft. The partnership aims to sequester millions of tonnes of treated human waste, manure, and other organic materials deep underground to combat carbon dioxide emissions. This innovative approach not only addresses waste management issues but also contributes to climate change mitigation.
Omar Abou-Sayed, the visionary behind Vaulted Deep, emphasizes the dual benefits of their solution. By utilizing technology originally developed for the oil and gas sector, the company has successfully injected substantial amounts of carbon-rich waste deep underground, effectively removing significant amounts of carbon dioxide from the atmosphere. This process, which prevents the waste from decomposing and releasing carbon, aligns with Microsoft’s ambitious carbon-negative goals.
The collaboration between Vaulted Deep and Microsoft marks a significant milestone in the carbon dioxide removal industry, as it seeks to attract more customers and drive sustainable practices. Microsoft’s commitment to purchasing carbon removal credits underscores its dedication to achieving carbon negativity by 2030.
With the new agreement in place, Vaulted Deep plans to expand its operations to additional sites beyond its current locations in Los Angeles and Hutchinson, Kansas. These sites serve as testaments to the company’s effective waste injection strategies, with each location tailored to handle specific types of organic waste.
The potential of Vaulted Deep’s approach is immense, with estimates suggesting that it could remove up to 5 billion tonnes of CO2 annually, a significant step towards achieving net-zero emissions globally. By strategically identifying and acquiring access to various organic waste sources, the company aims to maximize its impact on carbon sequestration.
Furthermore, by storing waste underground instead of traditional disposal methods, Vaulted Deep not only mitigates carbon emissions but also reduces surface pollution levels. This is particularly crucial in addressing pollutants like nitrogen and PFAS, which are concentrated in organic waste and pose environmental risks.
While the concept of injecting waste deep underground presents a novel solution to waste management and carbon sequestration, experts like Diana Oviedo Vargas emphasize the importance of addressing contaminants effectively. Ensuring the safety and efficacy of waste injections involves stringent regulatory processes overseen by environmental authorities.
As Vaulted Deep continues to pioneer sustainable waste management practices, the collaboration with Microsoft heralds a new era of environmental stewardship and carbon neutrality. By harnessing innovative technologies and strategic partnerships, the journey towards a greener, more sustainable future is well underway.

The system injects waste deep underground
Vaulted Deep
Article amended on 25 July 2025
We clarified the relationship between Vaulted Deep and Microsoft.