Step 1: Understand the achievement being asked about.
The SKOCH Award 2025 in this case recognized the development of an indigenous Cell Broadcast disaster alert system for India.
Step 2: Eliminate the other organizations.
BHEL and HAL work mainly in power equipment and aerospace, and DRDO focuses on broader defense research rather than telecom alert systems specifically.
Step 3: Recall the actual winner.
The Centre for Development of Telematics, known as C-DOT, was recognized for building this indigenous disaster alert technology.
\[ \boxed{\text{Centre for Development of Telematics (C-DOT)}} \]