|Michael||Complete "Blitz Play" and purchase the Sonar Collections Dock|
This mission has no Gold medal requirements. Instead, you must find all 30 submarine pieces scattered around the Los Santos seas. You are provided with a dinghy that has an onboard radar which will show as a green circle on your map. This indicates the pieces nearest to your current position. As you get nearer to them, the radar will change to a flashing white circle that gets smaller and smaller the nearer you come to a piece. It is similar to the Trackify app that you use for the nuclear waste collection.
The dinghy also provides you with scuba gear so there is no need to get suited up beforehand. You don’t technically need the submarine for your search as the green circle will still show on your map. You can also collect some pieces without scuba gear, notably those in shallow water near the docks. Should you wreck or lose your dinghy, simply go back to the docks and it will reappear there.