This was posted by Isotta, Clive's daughter Terrie on the Simon Says discussion board:
Clive was hospitalized for 8 days after undergoing a quintuple bypass surgery for his heart. He is home recouperating, and beginning to feel stronger each day. Dirk, Dayna and I have been taking very good care of him, although
he is eager to return to working on his next novel....a western story. Clive will so appreciate your thoughts and well wishes, and I will make sure he reads them all.
Thanks for the news, Madame-Pitt, I know I had no idea he was having a problem. Dr Cussler will be in my prayers as he recovers.
It seems to me that this group is in a unique position to send our "well wishes" to him in some special communal way. Should someone devises a plan, I would be happy to contribute.