It may look like disaster is afoot on the Detroit River this weekend.
But don't be alarmed, it's just a drill.
The Windsor Police Marine Unit will join Windsor based Naval reservists from the HMCS Hunter to test their readiness in the event of an emergency.
Police say emergency responders from on both side of the border will be performing search and rescue drills Saturday and Sunday.
Anyone witnessing an emergency on the water not connected to the exercise should still call 911.