[wongarsu]

Sure, they are less likely to fail in the stable environment, but you can't get to it until you pull up the entire vessel. On land 5.9% of servers required a technician to walk over there and replace components. At sea 0.7% of servers failed irrecoverably.

On the other hand 0.7% dead hardware sounds like a marginal cost. What likely killed it was the cost to deploy and recover them, plus all the hassle with sea cables for data and power. Building glorified warehouses with redundant power and AC is likely a lot cheaper than deploying these metal tanks in the ocean.