Why do you think about buying Monterey Accelerated Research System (MARS) which "is a cabled-based observatory system below the surface of Monterey Bay ... operational since November 10, 2008, incorporates a 52 km (32 mi) #undersea cable that carries data and power to benthic instrument nodes, AUVs, and various benthic and moored instrumentation" ? https://en.wikipedia.org/wiki/MARS_%28oceanography%29