I mean, while this is funny, technically
1) It was an implosion, not an explosion.
2) It is a submersible, not a submarine. It is incapable of moving and supporting itself over long distances and for long periods of time. Submarines don't need launch/support crafts.
3) All the navy knew for sure was that something in that area imploded, not that the Titan imploded. It could have even been one of the ballasts off the craft, leaving it stranded on the bottom. Therefore, they had to continue S&R operations until they could confirm it was the craft, just in case. But it did help them pinpoint where to search once they did get a depth-capable ROV on scene, which is why they found the wreckage so fast (fun fact, the ROV can only light up an area the size of a tennis court at that depth, and moves at about a walking pace, so not knowing where to start could have taken a long time to find anything).
In other news, did you hear about all the stress going on at OceanGate? I hear that the CEO has been under a lot of pressure lately.