A concept question not a problem. When draw force diagrams I see that Tension is

Question

A concept question not a problem.
When draw force diagrams I see that Tension is shown to go down the rope with hot air balloons anchored/tethered to ground by rope.
However with buoyancy problems like a buoy or object tethered to floor of ocean/lake we say that not only does Fb go up (I get that) but that tension of cable holding/anchoring buoy is also upwards.
Why is tension up with one scenario but downward with other? A concept question not a problem.
When draw force diagrams I see that Tension is shown to go down the rope with hot air balloons anchored/tethered to ground by rope.
However with buoyancy problems like a buoy or object tethered to floor of ocean/lake we say that not only does Fb go up (I get that) but that tension of cable holding/anchoring buoy is also upwards.
Why is tension up with one scenario but downward with other?
When draw force diagrams I see that Tension is shown to go down the rope with hot air balloons anchored/tethered to ground by rope.
However with buoyancy problems like a buoy or object tethered to floor of ocean/lake we say that not only does Fb go up (I get that) but that tension of cable holding/anchoring buoy is also upwards.
Why is tension up with one scenario but downward with other?

Explanation / Answer

due to earth gravtiational force , tension would be actihng vertically downwards

while in water or liquids,

for a body to float , there acts a net buoyant force that acts opposite to the gravitational force

so

this wud be upwards

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