So where did the 70 foot wave go? Did it hit shore somewhere?
Rogue storm waves only last for a few seconds; they're caused by several normal storm waves that happen to get "in synch" for a brief period of time.
I have no idea! Where does it go? Just keep rolling on until it hits a shore somewhere? Maybe someone can answer that. Maybe it calms down on it's own. I truly don't know where a wave of that magnitude ends up.
It probably dissipated shortly after doing its thing on the cruise ship. A "freak" wave is called that because it's the product of two or more wave-generating sources -- two storms, for example -- that send out waves and they pile up on one another. This may have been a storm that sent out a forty-foot wave that encountered a thirty-foot wave from another storm that piled up on it and they traveled together for a while. Result: a 70-foot wave. But only temporary.
In 1965, my cruise ship to Vietnam, the USNS Gordon, was laid into by one of those at night while we were watching a movie on deck (Lawrence of Arabia); it was terrifying. I thought we were going to capsize.
This one did,
"A fact not known to many is the highest wave ever recorded struck in Trinidad on December 31, 1913. Lighthouse keeper, Fred Harrington, was performing his duties in the lighthouse perched 196 feet above sea level during a ferocious winter storm. As he turned to wipe the lantern room windows, he observed "a sea of unusual height". In his words, " The sea itself fell onto the top of the bluff and struck the tower on a level with the balcony, making a terrible jar." The spray flew forty feet above the crest. The lens was thrown off level by the wave but the plucky Mr. Harrington had the light back in operation in a half an hour."