JAMESTOWN, R.I. (AP) — A Rhode Island man is planning a 19-mile swim from Block Island to Jamestown later this month to raise money for a nonprofit that works to keep oceans clean.

Ben Tuff’s grueling swim on July 31 will raise money for Clean Ocean Access.

Just two years ago he swam 23 miles around Conanicut Island to raise more than $54,000 for the organization.

To keep safe, he’ll wear a shark-repellent device.

About two meters long, the device will trail behind him. It can be a burden, but Tuff said it will provide peace mind during a stretch of the swim when he won’t be able to see land.