- including armed operationsFor individuals with a justified suspicion and businesses that need evidence, not assumptions. Lawful surveillance in Vienna that holds up in court and in the boardroom.
Inquire confidentiallyWhether private or business-related – anyone who wants to act needs solid facts. Three typical situations where that's missing:
Whether infidelity, custody disputes or employee fraud: anyone who acts without documentation loses the argument before it even starts.
Conducting surveillance yourself, or having friends do it, usually tips off the person being observed before anything is documented.
Evidence gathered unlawfully is worthless when it matters most – and can even create legal consequences for the client.
Black Graben conducts private and corporate investigations lawfully under the Austrian trade code (§ 129 GewO 1994, private investigators) – from inquiries into personal circumstances, to tracing missing persons, to gathering evidence for court and administrative proceedings. Our methods are unobtrusive, our documentation complete, and admissible when it counts.
Our founders' operational experience from international security and investigative deployments feeds directly into every surveillance operation – from planning to evidence collection.
Trained methods that go unnoticed – by the person being observed and by those around them.
Photos, logs and reports are documented so they hold up when it matters.
Methodology from years of operational practice, applied to private and business cases in Austria.
Your inquiry stays confidential – regardless of the investigation's outcome.
Investigative work demands precision under pressure and the ability to operate unobtrusively in difficult conditions – skills our founders acquired in the field, not in a classroom.
Over 20 years assessing and mitigating complex risks for government institutions and private security organizations – the methodical foundation of every professional investigation.
Directed mission-critical operations on behalf of the U.S. Department of State and led training programs for local and international forces in Afghanistan and Iraq.
A fair comparison to standard guarding services and generic security providers – no names, just concrete criteria.
We listen to your concern and clarify the basic scope of the investigation.
We ensure the planned surveillance is permissible under the trade code.
Concrete methodology, timeframe and approach are defined.
You receive a structured, admissible investigation report.
Yes – under the Austrian trade code (§ 129 GewO 1994, security trade). As licensed private investigators, we work strictly within these legal limits.
Generally not. Our trained investigators operate unobtrusively and adapt their methods to the environment.
We document every surveillance operation carefully and lawfully, so the results hold up as evidence when it matters.
Yes. That includes tracing missing persons, clarifying paternity questions, locating unknown heirs, or support in stalking cases – all within the bounds of the trade code.
Every inquiry is reviewed personally and under absolute confidentiality. You'll learn in the initial consultation whether and how we can help you.
