After you fully harvest a dead shark, 4 meat and 1 shark head, the carcass immediately despawns and gives you 3 minutes before the new one spawns in. Try this, harvest only the 4 meats from the shark, leaving the head. The shark carcass will despawn in 5 minutes and then 3 mins later the new one will spawn in. This will give you 8 minutes of dive time without the shark. Nice progression.
After you fully harvest a dead shark, 4 meat and 1 shark head, the carcass immediately despawns and gives you 3 minutes before the new one spawns in. Try this, harvest only the 4 meats from the shark, leaving the head. The shark carcass will despawn in 5 minutes and then 3 mins later the new one will spawn in. This will give you 8 minutes of dive time without the shark. Nice progression.