The Sea Research Foundation Inc. failed to make monthly payments to a debt-service fund on $22.7 million of bonds during the first half of the year due to "financial difficulties," according to a material event notice filed last week.

The Connecticut Development Authority issued the bonds in 2007 to refund bonds sold in 1997 on behalf of the nonprofit foundation to renovate and expand the Mystic Aquarium and the Institute for Exploration in Stonington, Conn.

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