Veteran seamen had told Greenpeace the ship was dangerous, she said.
"A lot of old salts were coming up saying, 'it's a death trap'."
Shell NZ spokeswoman Shona Geary said three anchor cables had broken in gale force winds and 11m swells off Taranaki. "No one was injured and there was no harm to the environment. Maritime NZ investigated and found no further action was necessary."
The drill ship's anchor cables failed in a storm off the Taranaki coast last year.