A middle-aged man was feared drowned, while he was fishing in a pond at Kanchikacherla on Monday.
The duo on Ayyappa Deeksha flew to Kerala on Thursday and was supposed to return home on Saturday.
An exceptionally large buffalo herd was grazing in Namibia when they stampeded into the Chobe River while being chased by a pride of lions.
Nitisha Negi, who had gone to Australia to participate in an international sports tournament, was swept away by a storm at the beach in December last.
The two incidents happened almost simultaneously, said eyewitnesses.
"An overloaded pirogue, transporting illegal migrants, capsized in our waters," Batista told AFP by telephone, saying that the fisheries surveillance department had alerted him to the disaster.
The worried group immediately informed about the incident to the local and marine police and a search operation for the missing Jaithulla was initiated.
A case was registered and investigation is underway. The bodies have been shifted to Bapatla area hospital for postmortem.