For SOMA on the PC, SOMA Theta Lower Levels Map by SomaDeez.
Site Delta - SOMA Guide - IGN
SOMA FAQs, Walkthroughs, and Guides for PlayStation 4 - GameFAQs
Guide for SOMA - Site Tau
Theta Labs - SOMA Guide - IGN
Theta Maintenance - SOMA Guide - IGN
SOMA - Theta Maintenance: Turn Power on In Area / Door, Avoid
Theta station, SOMA Game Walkthrough - SOMA Guide
Theta walkthrough (first part) - Soma Wiki
Theta Labs - SOMA Guide - IGN
Theta walkthrough (second part) - Soma Wiki