Their families and friends have set up a Givealittle fundraising page in a bid to fund the repatriation.
Ben Rocky Neill, 47, and Rochelle Neill, 48, died by electrocution while repairing their tourist boat and that it was likely accidental, Tonga Deputy Police Commissioner Tevita Vailea said yesterday.
It is understood locals found the pair, who owned snorkelling business Hakau Adventures, before police were alerted.
Kaniva News reports a formal inquest was carried out over the weekend after the discovery.