"Chris Friesen" wrote

Conceivable, but that would be a pretty crappy design for a failsafe.
It should have a deadman switch such that if it gets no handshake from
the surface it shuts the valve.

Chris

Probably did, but that does not mean it will work. Watch "Seconds from
Disaster" on the Nat Geo channel and they will give you examples of how fail
safe situations can fail.