"Discover Waitomo is a world-renowned iconic tourism attraction that generates significant economic, cultural and employment benefits for the region," he said in a statement.
"Without this support, it may not have been possible to preserve this key asset, so it was important to act fast."
Regional support
Davis also said up to $20.2m of the fund was available for the country's 31 regional tourism organisations to support their local industries.
He said rebuilding the sector would depend on well-resourced regional organisations coordinating activities within the industry.
Rotorua mayor Steve Chadwick and Tourism Holdings chief executive Grant Webster have also been tapped to lead a public-private taskforce to "reimagine the future of tourism."
Today's first tranche of support only makes up a fraction of the $400m fund. Those tourism organisations considered key attractions, and which attract visitors to a region, can apply for support. Applications are open until June 18.
Davis will present to the Parliament's economic development, science and innovation select committee today on Vote Tourism in this year's Budget.